Identity providers can be created with specifed domain
Identity providers can be created with specifed domain

Add idp_domain_id parameter so that when creating an identity provider a
domain can be specified that the IDP resides within instead of creating
and belonging to a new auto generated domain.
This change is backwards compatible, idp_domain_id is optional.

Change-Id: If761dd4faf63cf09d436d9e0a22f7e90cec9a105

openstack/openstack-ansible-plugins,openstack/openstack-ansible-plugins