Included id_token_jwt in token response

[infohash]

The ID token JWT needs to be passed in the access token response to be usable as id_token_hint for RP-Initiated Logout. Refer to RP-Initiated Logout specification.

The existing code replaces JWT with the verified IdToken instance but it should be preserved. I've added id_token_jwt which stores signed and serialised ID token.

[tpazderka]

The quality check is failing.

[infohash]

@tpazderka Merged from upstream. Now all test cases are passing. Can you fix the failing job of build (3.6):

ERROR:   py36: commands failed
SKIPPED:  py37: InterpreterNotFound: python3.7
  py38: commands succeeded
  docs: commands succeeded
  quality: commands succeeded
Error: Process completed with exit code 1.

[tpazderka]

Yeah, I have decided to drop 3.6 so that should fix the issue :)

[codecov-commenter]

Codecov Report

Merging #805 (96893da) into master (a59f34c) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #805      +/-   ##
==========================================
+ Coverage   63.70%   63.72%   +0.01%     
==========================================
  Files          64       64              
  Lines       11846    11850       +4     
  Branches     2401     2410       +9     
==========================================
+ Hits         7547     7551       +4     
- Misses       3701     3702       +1     
+ Partials      598      597       -1     

Impacted Files	Coverage Δ
src/oic/oic/message.py	69.90% <100.00%> (+0.05%)	⬆️
src/oic/utils/authn/user.py	63.41% <0.00%> (-0.82%)	⬇️
src/oic/utils/http_util.py	69.25% <0.00%> (-0.58%)	⬇️
src/oic/utils/client_management.py	50.37% <0.00%> (-0.38%)	⬇️
src/oic/extension/sts.py	0.00% <0.00%> (ø)
src/oic/utils/keyio.py	71.56% <0.00%> (+0.13%)	⬆️
src/oic/oauth2/message.py	74.14% <0.00%> (+0.42%)	⬆️
src/oic/utils/time_util.py	91.71% <0.00%> (+1.33%)	⬆️

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