tree d4d4cd272860c1e1df7b2df13e428a043e76f6e9
parent ecc33b29c8bfdde6d299a6c632b394d83887c32a
author Masayuki Igawa <masayuki@igawa.io> 1565248511 +0900
committer Masayuki Igawa <masayuki@igawa.io> 1565256280 +0900
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Retry http requests to generate plugins list

This commit retries http requests to generate a plugins list. We often
see internal server errors(500) in the gate. It makes sanity jobs fail.
So, it would be better to retry internally instead of 'recheck'. To
accomplish it, this uses urllib3 module.
NOTE: The default total number of retries[0] is 10. It should be enough
for us.

[0] https://urllib3.readthedocs.io/en/latest/reference/urllib3.util.html#urllib3.util.retry.Retry

Change-Id: Id3da3e2895fc2324d5a2db91f82b12ec5bb610f8