Updated openstack/openstack
Project: openstack/trove  b36fefec5d6b9e49d189c13d30c22ad0e9ca706f

Rename generic variable named with mysql specific name

Method migrate_data in VolumeDevice class is called by all datastores.
Input variable "mysql_base" and method's description are  misleading.

Change-Id: I5c71018f8ce61b9673dd83f4fa790c8cd0dfc954
Closes-Bug: #1393511