[services-ng] fix mysql backup

Change-Id: I8e485f370d4355e41e878e9fab205ce63f5a6e12
[services-ng] postgresql backup supports multiple versions

Change-Id: Ib1f41e2edf414561d6c248c4ef705ba60a323af7
Merge "[services-ng] postgresql backup supports multiple versions"
Merge "[services-ng] fix mysql backup"