Move to use "get_password" instead of "{user,service,db}_password"

The user_password, service_password and db_password functions are redundant
since they simply call "secret". Creates a get_password function that will
accept a "type" of db, service or user.

All instances of these calls have been changed to call get_password

Change-Id: Ifdb5c7b3f590431aaa7ffc021cdee34899ac8c15
Partial-Bug: #1195915
change default cinder.volume.driver

Fixes: bug #1269438

New lvm iscsi driver path is:

cinder.volume.drivers.lvm.LVMISCSIDriver

Change-Id: I3427e80c78ec52a6b02cd42d25f425e03e15f01f
Add name template attributes

Change-Id: I861451d137c2436ae8bb792570751d1ddb754906
Merge "Move to use "get_password" instead of "{user,service,db}_password""
Merge "change default cinder.volume.driver"
Merge "Add name template attributes"