pylint fixes

[flo-renaud]

• ignore false positive for signature-differs when the method is overriden with *args, **kwargs
• remove unused variable

[abbra]

Few issues as seen by fastlint:

2021-02-03T09:20:03.9329063Z Fast linting with /usr/bin/python from branch 'gc-wip-update'
2021-02-03T09:20:04.0353986Z Fast linting files:
2021-02-03T09:20:04.0355092Z ipaplatform/redhat/services.py
2021-02-03T09:20:04.0355632Z ipaserver/install/gcinstance.py
2021-02-03T09:20:04.0356001Z 
2021-02-03T09:20:04.0356403Z pycodestyle
2021-02-03T09:20:04.0357442Z -----------
2021-02-03T09:20:04.1400566Z ./ipaplatform/redhat/services.py:170:38: E261 at least two spaces before inline comment
2021-02-03T09:20:04.1401546Z ./ipaplatform/redhat/services.py:174:37: E261 at least two spaces before inline comment
2021-02-03T09:20:04.1402221Z ./ipaplatform/redhat/services.py:178:50: E261 at least two spaces before inline comment
2021-02-03T09:20:04.1402841Z ./ipaplatform/redhat/services.py:182:40: E261 at least two spaces before inline comment
2021-02-03T09:20:04.1403436Z ./ipaplatform/redhat/services.py:186:39: E261 at least two spaces before inline comment
2021-02-03T09:20:04.1404047Z ./ipaplatform/redhat/services.py:190:40: E261 at least two spaces before inline comment
2021-02-03T09:20:04.1404652Z ./ipaplatform/redhat/services.py:194:43: E261 at least two spaces before inline comment
2021-02-03T09:20:04.1405620Z ./ipaplatform/redhat/services.py:198:43: E261 at least two spaces before inline comment
2021-02-03T09:20:04.2673211Z ./ipaserver/install/gcinstance.py:470:38: E261 at least two spaces before inline comment
2021-02-03T09:20:04.2674265Z ./ipaserver/install/gcinstance.py:475:37: E261 at least two spaces before inline comment
2021-02-03T09:20:04.2729565Z make: *** [Makefile:1232: fastlint] Error 1
2021-02-03T09:20:04.2811398Z ##[error]Bash exited with code '2'.
2021-02-03T09:20:04.3236755Z ##[section]Finishing: Quick code style check

[abbra]

Thanks, merged.