Fixed RP-Initiated Logout To Accept id_token_hint

[infohash]

Addresses #826

According to OIDC specs on RP-Initiated logout, the expected arguments are post_logout_redirect_uri and id_token_hint that accepts raw ID token JWT.

Added a default parameter id_token_hint in oic.Client.construct_EndSessionRequest & oic.Client.do_end_session_request to make them comply with OIDC specs.

[codecov-commenter]

Codecov Report

Merging #829 (da668f5) into master (2735921) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

❗ Current head da668f5 differs from pull request most recent head ef8afa2. Consider uploading reports for the commit ef8afa2 to get more accurate results

@@            Coverage Diff             @@
##           master     #829      +/-   ##
==========================================
- Coverage   63.80%   63.77%   -0.04%     
==========================================
  Files          64       64              
  Lines       11877    11877              
  Branches     2158     2158              
==========================================
- Hits         7578     7574       -4     
- Misses       3695     3699       +4     
  Partials      604      604              

Impacted Files	Coverage Δ
src/oic/oic/__init__.py	64.99% <100.00%> (ø)
src/oic/utils/authn/user.py	63.41% <0.00%> (-0.82%)	⬇️
src/oic/utils/http_util.py	69.25% <0.00%> (-0.58%)	⬇️

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[infohash]

@tpazderka @schlenk Can you review and prepare the release for 3.11?

[schlenk]

LGTM.