Remove ldap identity domain attribute options

LDAP Identity backend is not domain aware, and therefore does not
need mappings for the domain attributes for user and group.

closes-bug: 1209440
Change-Id: Ib7b77b90134322d04b5826b151d05535b9b8b7c7
Merge "Remove ldap identity domain attribute options"
Check token_format for default token providers only.

Ignore token_format check if the configured token provider is not one of
Keystone default token providers.

Fixed bug 1227980

Change-Id: Id318177f186d1f68b0f3e5cba1bfaa98a4b2db24