Fixes duplicated DELETE queries on SQL backends

The SQL deletion queries were sent twice a delete, for these entity types:
 - Region
 - Identity provider (federation extension)
 - Protocol (federation extension)
 - Consumer (oauth1 extension)
 - Access token (oauth1 extension)
 - request token (oauth1 extension)

Change-Id: Ibfaea87a24cac00f2a187eb5c8c8917b1f0a1929
Closes-Bug: 1324076