R1:324dd3c0d617

Reduce wait_timeout to max. allowed value

Summary: http://dev.mysql.com/doc/mysql/en/server-system-variables.html#sysvar_wait_timeout

Test Plan:
$ arc unit

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D5590