Added return-request-id-to-caller function to resources and resource
managers in the following files.
* keystoneclient/v3/projects.py
* keystoneclient/v3/registered_limits.py
* keystoneclient/v3/roles.py
* keystoneclient/v3/limits.py
* keystoneclient/v3/contrib/federation/saml.py
Also made changes in base.py for _put() method so that if
include_metadata is True, the response data should include request_id
instead of returning None as response.
Change-Id: Ifc0ec9a9d666cccfee3b08ac61596a3692307f23
Implements: blueprint return-request-id-to-caller