Fixes #880

[mcdafydd]

Fixes pull request status integration between Atlantis and Azure Devops. This should allow users to implement pull request status policies.

[codecov]

Codecov Report

Merging #886 into master will decrease coverage by 0.09%.
The diff coverage is 56.25%.

@@            Coverage Diff            @@
##           master     #886     +/-   ##
=========================================
- Coverage   71.83%   71.73%   -0.1%     
=========================================
  Files          65       65             
  Lines        5247     5268     +21     
=========================================
+ Hits         3769     3779     +10     
- Misses       1191     1195      +4     
- Partials      287      294      +7

Impacted Files	Coverage Δ
server/events/vcs/azuredevops_client.go	69.78% <56.25%> (-4.28%)	⬇️
server/server.go	63.58% <0%> (+0.58%)	⬆️

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