[python-committers] Bring back Travis & AppVeyor, make VSTS non-blocking

[Gregory P. Smith]

VSTS is clearly not yet a stable continuous integration platform.  It needs
to be made non-blocking, and AppVeyor and Travis need to be brought back!

Examples:
 https://github.com/python/cpython/pull/6938#issuecomment-389908094
   Windows broke -
https://python.visualstudio.com/cpython/_build?buildId=522
 https://github.com/python/cpython/pull/6939
   Linux broke - https://python.visualstudio.com/cpython/_build?buildId=523

This was on a documentation-only change.

We cannot be changing to new PR-merge-blocking continuous integration
services at this point during a release cycle.  This is preventing changes
from making it in.

-gps
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