Travis stalled build detector should restart a stalled build at most 3 times on the same pull request

[jrafanie]

From: https://github.com/ManageIQ/manageiq/pull/3258

Since we don't delete old comments on the pull request (by design), we could check to see how many comments on the PR begin with the tag: <stalled_finished_job /> and skip the PR entirely if there are already 3 comments.

It's easy to test this by creating a PR with a test that does sleep 60 * 15, it should stall after ten minutes, get restarted, etc. 3 times.

[Fryguy]

:+1:

[miq-bot]

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