[CI] Add retries to full CI smoke test
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good first issue
Priority 2 (maybe one day)
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- Shell
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Description
The most recent full CI build (at the time of this writing) [failed](https://travis-ci.org/Azure/Moodle/builds/383766636) due to connection refused, but it was just transient (manually browsed the site and confirmed it worked). We should add some retries to the full CI's smoke test code so that these transient failures wouldn't cause full CI failures. Relevant code is [here](https://github.com/Azure/Moodle/blob/master/etc/travis/DeploymentTester.py#L149).
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