Rndmh3ro namespace get job with tests

[jrxFive]

Namespace override for get_jobs

Add tests for #119. Addresses #118.

[codecov-commenter]

Codecov Report

Merging #121 (0cadab0) into master (1cc1077) will decrease coverage by 0.04%.
The diff coverage is 87.50%.

❗ Current head 0cadab0 differs from pull request most recent head e8c4c55. Consider uploading reports for the commit e8c4c55 to get more accurate results

@@            Coverage Diff             @@
##           master     #121      +/-   ##
==========================================
- Coverage   90.61%   90.56%   -0.05%     
==========================================
  Files          26       26              
  Lines        1065     1070       +5     
==========================================
+ Hits          965      969       +4     
- Misses        100      101       +1     

Impacted Files	Coverage Δ
nomad/api/job.py	93.24% <80.00%> (-1.13%)	⬇️
nomad/api/jobs.py	90.00% <100.00%> (+0.41%)	⬆️

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