Changed identify_record call to pass in model.

Added a new method controller_to_model that can be used to pass in model to identify_record call to fix an issue where find for VmInfra record was blowing up for MiqTemplate record.

https://bugzilla.redhat.com/show_bug.cgi?id=1110964
https://bugzilla.redhat.com/show_bug.cgi?id=1113186