optional_args doesn't have "huge_tree" as an available parameter for JunOS

[architkhatri98]

Description of Issue/Question

https://github.com/napalm-automation/napalm/blob/develop/napalm/junos/junos.py#L59
In the JunOSDriver() Constructor, there is no way to use huge_tree as an optional arg.
ncclient/ncclient#185 in this issue, whenever an xml node is greater than 10,000,000 bytes, an exception is raised lxml.etree.XMLSyntaxError: xmlSAX2Characters: huge text node
To fix this jnpr.junos.device.Device() introduced a huge_tree parameter here. Juniper/py-junos-eznc#975

But napalm doesn't support the huge_tree parameter yet. Due to this, I am seeing the same exception raised whenever I call get_config()

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Did you follow the steps from https://github.com/napalm-automation/napalm#faq

(Place an x between the square brackets where applicable)

• Yes
• [] No

Setup

napalm version

(Paste verbatim output from pip freeze | grep napalm between quotes below)

4.10

Network operating system version

(Paste verbatim output from show version - or equivalent - between quotes below)

Junos 21.2R3-S5.4

Steps to Reproduce the Issue

device.get_config()

Error Traceback

(Paste the complete traceback of the exception between quotes below)

INFO:ncclient.transport.ssh:[host 127.0.0.1 session-id 91995] Received message from host
/Users/arkhatri/.pyenv/versions/olympus/lib/python3.8/site-packages/jnpr/junos/device.py:857: RuntimeWarning: An unknown exception occurred - please report.
  warnings.warn(
Traceback (most recent call last):
  File "test_junos.py", line 18, in <module>
    current_config = device.get_config()
  File "/Users/arkhatri/.pyenv/versions/olympus/lib/python3.8/site-packages/olympus_nqa/Device.py", line 1751, in get_config
    return executor(retrieve=retrieve)
  File "/Users/arkhatri/.pyenv/versions/olympus/lib/python3.8/site-packages/olympus_nqa/Device.py", line 179, in _run
    return getattr(self.device, method)(*args, **kwargs)
  File "/Users/arkhatri/.pyenv/versions/olympus/lib/python3.8/site-packages/napalm/junos/junos.py", line 2448, in get_config
    config = self.device.rpc.get_config(filter_xml=None, options=options)
  File "/Users/arkhatri/.pyenv/versions/olympus/lib/python3.8/site-packages/jnpr/junos/rpcmeta.py", line 151, in get_config
    response = self._junos.execute(rpc, **kwargs)
  File "/Users/arkhatri/.pyenv/versions/olympus/lib/python3.8/site-packages/jnpr/junos/decorators.py", line 76, in wrapper
    return function(*args, **kwargs)
  File "/Users/arkhatri/.pyenv/versions/olympus/lib/python3.8/site-packages/jnpr/junos/decorators.py", line 31, in wrapper
    return function(*args, **kwargs)
  File "/Users/arkhatri/.pyenv/versions/olympus/lib/python3.8/site-packages/jnpr/junos/device.py", line 834, in execute
    rpc_rsp_e = self._rpc_reply(
  File "/Users/arkhatri/.pyenv/versions/olympus/lib/python3.8/site-packages/jnpr/junos/decorators.py", line 117, in wrapper
    rsp = function(self, *args, **kwargs)
  File "/Users/arkhatri/.pyenv/versions/olympus/lib/python3.8/site-packages/jnpr/junos/device.py", line 1470, in _rpc_reply
    return self._conn.rpc(rpc_cmd_e, filter_xml)._NCElement__doc
  File "/Users/arkhatri/.pyenv/versions/olympus/lib/python3.8/site-packages/ncclient/manager.py", line 246, in execute
    return cls(self._session,
  File "/Users/arkhatri/.pyenv/versions/olympus/lib/python3.8/site-packages/ncclient/operations/third_party/juniper/rpc.py", line 52, in request
    return self._request(rpc)
  File "/Users/arkhatri/.pyenv/versions/olympus/lib/python3.8/site-packages/ncclient/operations/rpc.py", line 365, in _request
    self._reply.parse()
  File "/Users/arkhatri/.pyenv/versions/olympus/lib/python3.8/site-packages/ncclient/operations/rpc.py", line 161, in parse
    root = self._root = to_ele(self._raw, huge_tree=self._huge_tree) # The <rpc-reply> element
  File "/Users/arkhatri/.pyenv/versions/olympus/lib/python3.8/site-packages/ncclient/xml_.py", line 129, in to_ele
    return x if etree.iselement(x) else etree.fromstring(x.encode('UTF-8'), parser=_get_parser(huge_tree))
  File "src/lxml/etree.pyx", line 3257, in lxml.etree.fromstring
  File "src/lxml/parser.pxi", line 1916, in lxml.etree._parseMemoryDocument
  File "src/lxml/parser.pxi", line 1803, in lxml.etree._parseDoc
  File "src/lxml/parser.pxi", line 1144, in lxml.etree._BaseParser._parseDoc
  File "src/lxml/parser.pxi", line 618, in lxml.etree._ParserContext._handleParseResultDoc
  File "src/lxml/parser.pxi", line 728, in lxml.etree._handleParseResult
  File "src/lxml/parser.pxi", line 657, in lxml.etree._raiseParseError
  File "<string>", line 496650
lxml.etree.XMLSyntaxError: xmlSAX2Characters: huge text node, line 496650, column 41 

[ktbyers]

@architkhatri98 Do you want to submit a pull-request to fix this?

[architkhatri98]

@ktbyers yes, I've opened up a pull-request with the fix.
#2013