use console_scripts entry point to package bgpmon

dockers/docker-fpm-frr/base_image_files/monit_bgp

@@ -23,5 +23,5 @@ check process staticd matching "/usr/lib/frr/staticd"
 check process bgpcfgd matching "python /usr/local/bin/bgpcfgd"
     if does not exist for 5 times within 5 cycles then alert
 
-check process bgpmon matching "python /usr/local/bin/bgpmon.py"
+check process bgpmon matching "python /usr/local/bin/bgpmon"
     if does not exist for 5 times within 5 cycles then alert

dockers/docker-fpm-frr/frr/supervisord/supervisord.conf.j2

@@ -85,7 +85,7 @@ dependent_startup=true
 dependent_startup_wait_for=bgpd:running
 
 [program:bgpmon]
-command=/usr/local/bin/bgpmon.py
+command=/usr/local/bin/bgpmon
 priority=6
 autostart=false
 autorestart=false

src/sonic-bgpcfgd/setup.py

@@ -9,7 +9,12 @@
       author_email='[email protected]',
       url='https://github.com/Azure/sonic-buildimage',
       packages=setuptools.find_packages(),
-      scripts=['bgpcfgd','bgpmon.py'],
+      scripts=['bgpcfgd'],
+      entry_points={
+          'console_scripts': [
+              'bgpmon = bgpmon:main',
+          ]
+      },
       install_requires=['jinja2>=2.10', 'netaddr', 'pyyaml'],
       setup_requires=['pytest-runner', 'pytest'],
 )