update postgresql version in sample config to 9.1

Change-Id: I2aef0bf45bad0c2ad9f8aa3e2f7b48c921510e68
update mysql version in sample config to 5.5

Change-Id: Idb01b7be5e844779ffd95be6a6a7652c08450143
Merge "update mysql version in sample config to 5.5"
Merge "update postgresql version in sample config to 9.1"