[DONT MERGE] Try using mmapv1 storage engine on Travis #4292
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This pull request updates MongoDB config so we try and use
mmapv1
storage engine on Travis.I'm just curious if it will help make builds faster.
On a related note, sadly unit tests running under MongoDB 3.6 are consitently 40-60% slower than the ones running under 3.4.
I wonder if it's related to https://jira.mongodb.org/browse/SERVER-24580.