Updated openstack/openstack
Project: openstack/trove  ad69a73742d06e8b83ee8e81483a8235a98448c1
null
Make backup/restore pluggable

Reason:
 - mutliple datastore support;
 - execute_backup expects that instance that
   is going to be backuped is a mysql server
   (expects that my.cnf exist).
Changes:
 - oslo groups added;
 - updating MySQLDump strategy;
 - cleaning runner parameters;
 - updating tests;

Change-Id: Id98ac37c048db79cd24adfa22f0db722648cf55b
Closes-Bug: #1281127