Feat/xmlrpc rename

[AleksMat]

Changes:

• renamed repository xmlrpc to rpc
• updated pylint in makefile
• fixed a pylint issue

This PR is related to #682

[coveralls]

Pull Request Test Coverage Report for Build 4612

• 35 of 35 (100.0%) changed or added relevant lines in 19 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 72.717%

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Totals
Change from base Build 4610:	0.0%
Covered Lines:	3729
Relevant Lines:	4854

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💛 - Coveralls

[codecov-io]

Codecov Report

Merging #1165 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1165   +/-   ##
=======================================
  Coverage   72.43%   72.43%           
=======================================
  Files         119      119           
  Lines        4854     4854           
  Branches      606      606           
=======================================
  Hits         3516     3516           
  Misses       1125     1125           
  Partials      213      213

Impacted Files	Coverage Δ
tcms/settings/common.py	95.58% <ø> (ø)	⬆️
tcms/rpc/api/testexecutionstatus.py	75% <ø> (ø)
tcms/rpc/utils.py	53.06% <ø> (ø)
tcms/rpc/api/utils.py	71.42% <ø> (ø)
tcms/rpc/api/classification.py	75% <ø> (ø)
tcms/rpc/decorators.py	85.71% <ø> (ø)
tcms/rpc/api/auth.py	60.86% <ø> (ø)
tcms/rpc/api/__init__.py	100% <ø> (ø)
tcms/rpc/tests/utils.py	100% <ø> (ø)
tcms/rpc/api/testcasestatus.py	75% <ø> (ø)
... and 24 more

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