[Buildbot] #3598: Implement pipeline for integration with GitHub (or other provider) that will allow to safely run BB tests for PR

[Buildbot trac]

#3598: Implement pipeline for integration with GitHub (or other provider) that
will allow to safely run BB tests for PR
------------------------+-----------------------
Reporter:  rutsky       |      Owner:
    Type:  enhancement  |     Status:  new
Priority:  major        |  Milestone:  undecided
 Version:  master       |   Keywords:
------------------------+-----------------------
 General idea of usage is:

 * somebody creates PR

 * one of github org members reviews PR and marks is as "safe to test"

 * BB bot sees such comments in PR and runs test for pull request

 * BB bot updates PR status using regular GitHub Status API (or BitBucket
 or other).

 Probably this pipeline already can be implemented using current GitHub
 integration, then it should be documented.

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Ticket URL: <http://trac.buildbot.net/ticket/3598>
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Buildbot: build/test automation