[TestbedV2]Add a script to get duts version. (sonic-net#8290)

Description of PR
In TestbedV2, we need a script to get duts version for futher process. So, we add this script using new sonichost, and this script will return a list contains the output of show version command.

What is the motivation for this PR?
In TestbedV2, we need a script to get duts version for futher process. So, we add this script using new sonichost, and this script will return a list contains the output of show version command.

How did you verify/test it?
```
yutongzhang@89d3967bee2a:/data/sonic-mgmt/tests$ python ../.azure-pipelines/get_dut_version.py -i veos_vtb -t vms-kvm-t0 --tbfile vtestbed.yaml --log-level info
/usr/local/lib/python2.7/dist-packages/ansible/parsing/vault/__init__.py:44: CryptographyDeprecationWarning: Python 2 is no longer supported by the Python core team. Support for it is now deprecated in cryptography, and will be removed in the next release.
  from cryptography.exceptions import InvalidSignature
2023-05-12 05:55:59,156 get_dut_version.py#53 INFO - Initializing hosts
Friday 12 May 2023  05:55:59 +0000 (0:00:00.048)       0:00:00.048 ************ 
{u'vlab-01': [u'', u'SONiC Software Version: SONiC.master.217155-43683d8ce', u'Distribution: Debian 11.6', u'Kernel: 5.10.0-18-2-amd64', u'Build commit: 43683d8ce', u'Build date: Sun Feb 12 12:36:40 UTC 2023', u'Built by: AzDevOps@vmss-soni000H4X', u'', u'Platform: x86_64-kvm_x86_64-r0', u'HwSKU: Force10-S6000', u'ASIC: vs', u'ASIC Count: 1', u'Serial Number: N/A', u'Model Number: N/A', u'Hardware Revision: N/A', u'Uptime: 05:55:59 up  2:58,  0 users,  load average: 0.19, 0.09, 0.06', u'Date: Fri 12 May 2023 05:55:59', u'', u'Docker images:', u'REPOSITORY                    TAG                       IMAGE ID       SIZE', u'docker-orchagent              latest                    fab81f7965ca   385MB', u'docker-orchagent              master.217155-43683d8ce   fab81f7965ca   385MB', u'docker-dhcp-relay             latest                    798c1d8e105e   366MB', u'docker-fpm-frr                latest                    b90063fc114e   403MB', u'docker-fpm-frr                master.217155-43683d8ce   b90063fc114e   403MB', u'docker-macsec                 latest                    a5d96f600dde   376MB', u'docker-eventd                 latest                    b078e56f320c   357MB', u'docker-eventd                 master.217155-43683d8ce   b078e56f320c   357MB', u'docker-teamd                  latest                    48c07e3fb87b   374MB', u'docker-teamd                  master.217155-43683d8ce   48c07e3fb87b   374MB', u'docker-snmp                   latest                    89d581a798c9   397MB', u'docker-snmp                   master.217155-43683d8ce   89d581a798c9   397MB', u'docker-platform-monitor       latest                    59d1ec13726a   479MB', u'docker-platform-monitor       master.217155-43683d8ce   59d1ec13726a   479MB', u'docker-gbsyncd-vs             latest                    b16d861d199a   367MB', u'docker-gbsyncd-vs             master.217155-43683d8ce   b16d861d199a   367MB', u'docker-sonic-telemetry        latest                    28213beda767   655MB', u'docker-sonic-telemetry        master.217155-43683d8ce   28213beda767   655MB', u'docker-sonic-p4rt             latest                    49c358ff0d13   927MB', u'docker-sonic-p4rt             master.217155-43683d8ce   49c358ff0d13   927MB', u'docker-mux                    latest                    14a8564a6e4e   405MB', u'docker-mux                    master.217155-43683d8ce   14a8564a6e4e   405MB', u'docker-lldp                   latest                    6e2eff7f72fb   399MB', u'docker-lldp                   master.217155-43683d8ce   6e2eff7f72fb   399MB', u'docker-database               latest                    62cfbd21d70a   357MB', u'docker-database               master.217155-43683d8ce   62cfbd21d70a   357MB', u'docker-router-advertiser      latest                    a95354dff017   357MB', u'docker-router-advertiser      master.217155-43683d8ce   a95354dff017   357MB', u'docker-nat                    latest                    13fbcda3340f   351MB', u'docker-nat                    master.217155-43683d8ce   13fbcda3340f   351MB', u'docker-sflow                  latest                    a3c41fe14a6b   349MB', u'docker-sflow                  master.217155-43683d8ce   a3c41fe14a6b   349MB', u'docker-sonic-mgmt-framework   latest                    b7065fdb0839   477MB', u'docker-sonic-mgmt-framework   master.217155-43683d8ce   b7065fdb0839   477MB', u'docker-syncd-vs               latest                    34101b26e558   346MB', u'docker-syncd-vs               master.217155-43683d8ce   34101b26e558   346MB']}
```

Signed-off-by: Yutong Zhang <[email protected]>

.azure-pipelines/get_dut_version.py

@@ -0,0 +1,112 @@
+import argparse
+import logging
+import os
+import sys
+
+_self_dir = os.path.dirname(os.path.abspath(__file__))
+base_path = os.path.realpath(os.path.join(_self_dir, ".."))
+if base_path not in sys.path:
+    sys.path.append(base_path)
+ansible_path = os.path.realpath(os.path.join(_self_dir, "../ansible"))
+if ansible_path not in sys.path:
+    sys.path.append(ansible_path)
+
+from devutil.devices import init_localhost, init_testbed_sonichosts     # noqa E402
+
+logger = logging.getLogger(__name__)
+
+RC_INIT_FAILED = 1
+RC_GET_DUT_VERSION_FAILED = 2
+
+
+def get_duts_version(sonichosts):
+    try:
+        ret = {}
+        duts_version = sonichosts.command("show version")
+        for dut, version in duts_version.items():
+            ret[dut] = version["stdout_lines"]
+        return ret
+    except Exception as e:
+        logger.error("Failed to get DUT version: {}".format(e))
+        sys.exit(RC_GET_DUT_VERSION_FAILED)
+
+
+def validate_args(args):
+    _log_level_map = {
+        "debug": logging.DEBUG,
+        "info": logging.INFO,
+        "warning": logging.WARNING,
+        "error": logging.ERROR,
+        "critical": logging.CRITICAL
+    }
+    logging.basicConfig(
+        stream=sys.stdout,
+        level=_log_level_map[args.log_level],
+        format="%(asctime)s %(filename)s#%(lineno)d %(levelname)s - %(message)s"
+    )
+
+
+def main(args):
+    logger.info("Validating arguments")
+    validate_args(args)
+
+    logger.info("Initializing hosts")
+    localhost = init_localhost(args.inventory, options={"verbosity": args.verbosity})
+    sonichosts = init_testbed_sonichosts(
+        args.inventory, args.testbed_name, testbed_file=args.tbfile, options={"verbosity": args.verbosity}
+    )
+
+    if not localhost or not sonichosts:
+        sys.exit(RC_INIT_FAILED)
+
+    return get_duts_version(sonichosts)
+
+
+if __name__ == "__main__":
+
+    parser = argparse.ArgumentParser(
+        formatter_class=argparse.ArgumentDefaultsHelpFormatter,
+        description="Tool for getting sonic device version.")
+
+    parser.add_argument(
+        "-i", "--inventory",
+        type=str,
+        dest="inventory",
+        required=True,
+        help="Ansible inventory file")
+
+    parser.add_argument(
+        "-t", "--testbed-name",
+        type=str,
+        required=True,
+        dest="testbed_name",
+        help="Testbed name."
+    )
+
+    parser.add_argument(
+        "--tbfile",
+        type=str,
+        dest="tbfile",
+        default="testbed.yaml",
+        help="Testbed definition file."
+    )
+
+    parser.add_argument(
+        "-v", "--verbosity",
+        type=int,
+        dest="verbosity",
+        default=2,
+        help="Log verbosity (0-3)."
+    )
+
+    parser.add_argument(
+        "--log-level",
+        type=str,
+        dest="log_level",
+        choices=["debug", "info", "warning", "error", "critical"],
+        default="debug",
+        help="Loglevel"
+    )
+
+    args = parser.parse_args()
+    main(args)