'state' in kwargs MUST NOT overwrite 'state' in request_args.

[rohe]

'state' in kwargs is used as a key to access information in the RP.
'state' in request_args is just a request argument.
They are not necessarily the same.

• Any changes relevant to users are recorded in the CHANGELOG.md.
• The documentation has been updated, if necessary.
• New code is annotated.
• Changes are covered by tests.

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[rohe]

The errors in travis-ci is not of my doing.

[codecov-io]

Codecov Report

Merging #698 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #698      +/-   ##
==========================================
+ Coverage    62.8%   62.82%   +0.01%     
==========================================
  Files          63       63              
  Lines       11521    11519       -2     
  Branches     2031     2030       -1     
==========================================
+ Hits         7236     7237       +1     
+ Misses       3705     3703       -2     
+ Partials      580      579       -1

Impacted Files	Coverage Δ
src/oic/oic/__init__.py	66.43% <100%> (+0.22%)	⬆️

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