Refactor CreateRouter to use update_dict
Refactor CreateRouter to use update_dict

At this point in time, 'distributed' is a positional argument and
thus doesn't need to be moved into the resource body.

Change-Id: I1d5c7c360fc76b5da9e145d70ce6d9e7a90d80bc

sajuptpm/python-neutronclient-ipam,Stavitsky/python-neutronclient,openstack/python-neutronclient,roaet/python-neutronclient,venusource/python-neutronclient,rackerlabs/rackspace-python-neutronclient,NeCTAR-RC/python-neutronclient,cernops/python-neutronclient,johnpbatty/python-neutronclient,huntxu/python-neutronclient,JioCloud/python-neutronclient,JioCloud/python-neutronclient,cryptickp/python-neutronclient,varunarya10/python-neutronclient,Juniper/python-neutronclient,roaet/python-neutronclient,varunarya10/python-neutronclient,mangelajo/python-neutronclient,venusource/python-neutronclient,Juniper/python-neutronclient,mangelajo/python-neutronclient,rackerlabs/rackspace-python-neutronclient,eayunstack/python-neutronclient,openstack/python-neutronclient,huntxu/python-neutronclient,eayunstack/python-neutronclient,johnpbatty/python-neutronclient,noironetworks/python-neutronclient,cernops/python-neutronclient,NeCTAR-RC/python-neutronclient,Stavitsky/python-neutronclient,sajuptpm/python-neutronclient-ipam,cryptickp/python-neutronclient,noironetworks/python-neutronclient