Adjust how redminelib API is used & doc-strings. Refs #1078

[atodorov]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 3764

• 0 of 5 (0.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.05%) to 72.317%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
tcms/issuetracker/types.py	0	5	0.0%

Files with Coverage Reduction	New Missed Lines	%
tcms/issuetracker/types.py	1	31.01%

Totals
Change from base Build 3762:	0.05%
Covered Lines:	3693
Relevant Lines:	4832

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💛 - Coveralls

[codecov-io]

Codecov Report

Merging #1082 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master    #1082   +/-   ##
=======================================
  Coverage   71.81%   71.81%           
=======================================
  Files         111      111           
  Lines        4832     4832           
  Branches      621      619    -2     
=======================================
  Hits         3470     3470           
  Misses       1139     1139           
  Partials      223      223

Impacted Files	Coverage Δ
tcms/issuetracker/types.py	31.73% <0%> (ø)	⬆️

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