Add domain parameter to Identity Provider

Identity providers are now associated with domains. This change
allows a user to specify a domain by ID or by name when creating
an identity provider. [0]

This also adds the column for Domain ID in listing.
Updating a domain for an identity provider is not supported, so
that isn't changed.

[0]. Id18b8b2fe853b97631bc990df8188ed64a6e1275

Closes-Bug: 1698390

Change-Id: Icc408e2fe88f257d5863bd3df716a777d52befcc

doc/source/cli/command-objects/identity-provider.rst

@@ -17,6 +17,7 @@ Create new identity provider
     openstack identity provider create
         [--remote-id <remote-id> [...] | --remote-id-file <file-name>]
         [--description <description>]
+        [--domain <domain>]
         [--enable | --disable]
         <name>
 
@@ -34,6 +35,11 @@ Create new identity provider
 
     New identity provider description
 
+.. option:: --domain
+
+    Name or ID of the domain to associate with the identity provider. If not
+    specified, one will be created automatically
+
 .. option:: --enable
 
     Enable the identity provider (default)