[hostcfgd.service] start after interfaces-config.service

[stepanblyschak]

This change fixes a race condition where the first ConfigDBConnector.connect() passes, however due to network stack gets reloaded in parallel it could be that the next call from KdumpCfg to 'sonic-kdump-config' command which invokes 'sonic-installer' which internally tries to connect to the database we might get a traceback:

Traceback (most recent call last):', '  File "/usr/local/bin/sonic-installer", line 5, in <module>, 
    from sonic_installer.main import sonic_installer', '  File "/usr/local/lib/python3.9/dist-packages/sonic_installer/main.py", line 7, in <module>', 
    import utilities_common.cli as clicommon', '  File "/usr/local/lib/python3.9/dist-packages/utilities_common/cli.py", line 189, in <module>',
     iface_alias_converter = InterfaceAliasConverter()', '  File "/usr/local/lib/python3.9/dist-packages/utilities_common/cli.py", line 126, in __init__', 
    self.port_dict = multi_asic.get_port_table()', '  File "/usr/local/lib/python3.9/dist-packages/sonic_py_common/multi_asic.py", line 301, in get_port_table',
     ports = get_port_table_for_asic(ns)', '  File "/usr/local/lib/python3.9/dist-packages/sonic_py_common/multi_asic.py", line 315, in get_port_table_for_asic',
     config_db = connect_config_db_for_ns(namespace)', '  File "/usr/local/lib/python3.9/dist-packages/sonic_py_common/multi_asic.py", line 47, in connect_config_db_for_ns',
     config_db.connect()',
   File "/usr/lib/python3/dist-packages/swsscommon/swsscommon.py", line 1829, in connect', 
   return _swsscommon.ConfigDBConnector_Native_connect(self, wait_for_init, retry_on)', 
'RuntimeError: Unable to connect to redis: Cannot assign requested address

And an error in the log during config reload:

Jan 25 22:28:03.209985 r-moose-simx-161 ERR hostcfgd: sonic-kdump-config --disable - failed: return code - 1, output:#012None
Jan 25 22:28:03.528764 r-moose-simx-161 ERR hostcfgd: sonic-kdump-config --memory 0M-2G:256M,2G-4G:320M,4G-8G:384M,8G-:448M - failed: return code - 1, output:#012None

Why I did it

To fix the errors in the log seen during config reload:

Jan 25 22:28:03.209985 r-moose-simx-161 ERR hostcfgd: sonic-kdump-config --disable - failed: return code - 1, output:#012None
Jan 25 22:28:03.528764 r-moose-simx-161 ERR hostcfgd: sonic-kdump-config --memory 0M-2G:256M,2G-4G:320M,4G-8G:384M,8G-:448M - failed: return code - 1, output:#012None

How I did it

Make hostcfg start after interfaces-config.service

How to verify it

Run config reload and verify no errors from hostcfgd.

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111

Description for the changelog

A picture of a cute animal (not mandatory but encouraged)