Update Job.get_status and Job.restore to consistently return JobStatus Enum

[indepndnt]

I wrote up what I found in issue #2038, so I though I should create a PR with my suggested fixes.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.76%. Comparing base (34f83d6) to head (08d5bd3). Report is 34 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2039      +/-   ##
==========================================
+ Coverage   93.61%   93.76%   +0.14%     
==========================================
  Files          28       29       +1     
  Lines        3758     3863     +105     
==========================================
+ Hits         3518     3622     +104     
- Misses        240      241       +1     

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[selwin]

Thanks!