Fix Cinder DB related issues
Fix Cinder DB related issues

Cinder started using 'LIKE BINARY' sql statements, which for some
reason don't work when using the default MySqlDB connector.

We'll explicitly request the pymysql connector to be used, avoiding
this issue.

rbuzatu90/cinder-ci,rbuzatu90/cinder-ci,cloudbase/cinder-ci,cloudbase/cinder-ci