Make tests less verbose.

[stefanoborini]

reduce clutter in the test by using LogTrapTestCase

[codecov-io]

Codecov Report

Merging #408 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #408      +/-   ##
==========================================
+ Coverage   95.23%   95.24%   +<.01%     
==========================================
  Files          96       96              
  Lines        4095     4102       +7     
  Branches      255      255              
==========================================
+ Hits         3900     3907       +7     
  Misses        143      143              
  Partials       52       52

Impacted Files	Coverage Δ
remoteappmanager/jupyterhub/tests/test_spawners.py	92.44% <100%> (+0.04%)	⬆️
.../auth/tests/test_github_whitelist_authenticator.py	100% <100%> (ø)	⬆️
remoteappmanager/services/tests/test_hub.py	100% <100%> (ø)	⬆️
...moteappmanager/handlers/tests/test_base_handler.py	100% <100%> (ø)	⬆️
remoteappmanager/tests/test_application.py	100% <100%> (ø)	⬆️
.../handlers/tests/test_register_container_handler.py	100% <100%> (ø)	⬆️
...oteappmanager/services/tests/test_reverse_proxy.py	100% <100%> (ø)	⬆️
...eappmanager/tests/mocking/virtual/docker_client.py	93.04% <100%> (+0.12%)	⬆️
...anager/handlers/admin/tests/test_admin_handlers.py	100% <100%> (ø)	⬆️
remoteappmanager/db/tests/test_orm.py	100% <100%> (ø)	⬆️
... and 6 more

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