SN-1938 Validate user id

[inbaltako]

No description provided.

[codecov-commenter]

Codecov Report

Merging #42 into master will decrease coverage by 1.55%.
The diff coverage is 97.46%.

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
- Coverage   84.05%   82.50%   -1.56%     
==========================================
  Files          50       48       -2     
  Lines        1135     1000     -135     
==========================================
- Hits          954      825     -129     
+ Misses        181      175       -6     

Impacted Files	Coverage Δ
securenative/models/request_context.py	100.00% <ø> (ø)
securenative/models/event_options.py	91.66% <80.00%> (-8.34%)	⬇️
securenative/models/sdk_event.py	87.09% <90.00%> (+2.48%)	⬆️
securenative/api_manager.py	80.76% <100.00%> (-11.54%)	⬇️
securenative/config/configuration_manager.py	82.35% <100.00%> (-0.99%)	⬇️
securenative/config/securenative_options.py	100.00% <100.00%> (ø)
securenative/context/securenative_context.py	100.00% <100.00%> (ø)
securenative/securenative.py	84.48% <100.00%> (+0.10%)	⬆️
securenative/utils/version_utils.py	100.00% <100.00%> (ø)
tests/api_manager_test.py	97.56% <100.00%> (-0.59%)	⬇️
... and 9 more

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