Reference: http://logs.openstack.org/88/518288/1/gate/congress-devstack-api-mysql/7d3725d/logs/devstacklog.txt.gz#_2017-11-17_07_47_33_608
Reference: http:// logs.openstack. org/88/ 518288/ 1/gate/ congress- devstack- api-mysql/ 7d3725d/ logs/devstacklo g.txt.gz# _2017-11- 17_07_47_ 33_608