Enabled request_id in RequestContext
Enabled request_id in RequestContext

As a means to enable logging on request id's, request_id in the RequestContext
can be set.

blueprint log-request-id

Change-Id: I13cd494d5af3255c03ec30e1040ef01c856c960d

gonzolino/heat,steveb/heat,steveb/heat,NeCTAR-RC/heat,pshchelo/heat,cwolferh/heat-scratch,maestro-hybrid-cloud/heat,NeCTAR-RC/heat,srznew/heat,miguelgrinberg/heat,jasondunsmore/heat,ntt-sic/heat,takeshineshiro/heat,openstack/heat,dims/heat,rh-s/heat,cryptickp/heat,maestro-hybrid-cloud/heat,openstack/heat,rh-s/heat,dragorosson/heat,redhat-openstack/heat,dims/heat,noironetworks/heat,jasondunsmore/heat,miguelgrinberg/heat,rdo-management/heat,pratikmallya/heat,pshchelo/heat,srznew/heat,noironetworks/heat,takeshineshiro/heat,pratikmallya/heat,rdo-management/heat,redhat-openstack/heat,ntt-sic/heat,dragorosson/heat,gonzolino/heat,cwolferh/heat-scratch,cryptickp/heat