Avoid truncating API Response
Avoid truncating API Response

Removes unnecessary escape characters from an exception message so that
it does not get truncated by the fault middleware in the wsgi pipeline.

Closes-Bug: #1335807
Change-Id: I20281042e617199b1f5a0507c56adca6a6dc601f

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