Fix IDP commands

identity_client.identity_providers doesn't exist as a manager. These are
located at identity_client.federation.identity_providers. Fix the
routes.

Also fix passing id to .create() as a positional argument. This is not
allowed from keystoneclient it should be passed as a keyword argument.

Change-Id: I912c27fcee58b0723e27e9147def2cbd1c62c288
Merge "Fix IDP commands"