Fixes

[ricardobranco777]

This PR:

• Tidies the Selenium test to allow proper cleanup
• Fixes SSL warning for valid certificates with openQA client
• Fixes wrong calls to log_err.
• Fixes broad exception catching of ClientError for EC2.
• Fixes broad exception catching of HttpError for GCE.

[codecov]

Codecov Report

Patch coverage: 47.05% and project coverage change: -0.16% ⚠️

Comparison is base (20a670c) 78.96% compared to head (7da5a49) 78.81%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #302      +/-   ##
==========================================
- Coverage   78.96%   78.81%   -0.16%     
==========================================
  Files          21       21              
  Lines        1607     1614       +7     
==========================================
+ Hits         1269     1272       +3     
- Misses        338      342       +4     

Files Changed	Coverage Δ
ocw/lib/ec2.py	78.43% <0.00%> (-0.59%)	⬇️
ocw/lib/gce.py	89.86% <0.00%> (-1.24%)	⬇️
ocw/lib/openqa.py	98.11% <100.00%> (+0.11%)	⬆️

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[asmorodskyi]

LGTM

[asmorodskyi]

LGTM !