Remove some deprecated identity options

Below options are deprecated on 2015, so it's safe to delete them now.
  * identity.admin_username
  * auth.admin_tenant_name
  * identity.admin_tenant_name
  * identity.admin_password
  * identity.admin_domain_name

Change-Id: I9cfd3b93f032e6816661e16cbb319af507835997
2 files changed