add prefixes option and tests

[jrxFive]

No description provided.

[codecov-io]

Codecov Report

Merging #85 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #85      +/-   ##
==========================================
+ Coverage   91.19%   91.23%   +0.04%     
==========================================
  Files          26       26              
  Lines        1033     1038       +5     
==========================================
+ Hits          942      947       +5     
  Misses         91       91

Impacted Files	Coverage Δ
nomad/api/namespaces.py	57.5% <100%> (+1.08%)	⬆️
nomad/api/allocations.py	100% <100%> (ø)	⬆️
nomad/api/jobs.py	89.58% <100%> (+0.22%)	⬆️
nomad/api/nodes.py	88.37% <100%> (+0.27%)	⬆️
nomad/api/evaluations.py	92.3% <100%> (+0.2%)	⬆️

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