[Octavia] octavia_identity v3 updates

Partially revert I59abe186cc170fe1a30a5e8bc46ba3d39cefa1c1
to return setting required for proper configs in _keystone.conf

Change-Id: I86dcf964ba4549a6ef8bb9a08371fd2cd8fd26d4
Related-PROD: PROD-24747
1 file changed