Initial Azure Pipelines config

[matmerr]

What this PR does / why we need it:
Replace CircleCI with Azure Pipelines

Special notes for your reviewer:
Azure Pipelines bot also required: https://github.com/marketplace/azure-pipelines

Release note:

NONE

[codecov]

Codecov Report

Merging #314 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #314   +/-   ##
=======================================
  Coverage   46.48%   46.48%           
=======================================
  Files          25       25           
  Lines        3418     3418           
=======================================
  Hits         1589     1589           
  Misses       1581     1581           
  Partials      248      248

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[jaer-tsun]

lgtm, just remove one of the commented lines (restserver test)

[matmerr]

@jaer-tsun sounds good

@sharmasushant If possible, we can switch to Azure Pipelines instead of CircleCI, we just need the app to be installed:
https://github.com/marketplace/azure-pipelines

I have a sample pr with pipelines enabled on my fork:
matmerr#8

[saiyan86]

@matmerr Remember to fill in the PR template...

[saiyan86]

/lgtm. But we still need to wait for @sharmasushant's input

[saiyan86]

/lgtm

[saiyan86]

Waiting for @sharmasushant's input

[saiyan86]

yay!