Updated openstack/openstack
Project: openstack/heat  3783ed664c07928871f8f5f037161f0d3f0ecc6f

Don't wrap HeatExceptions during validation

If an error of a known type (i.e. already a HeatException) occurs during
validation, don't wrap it in a StackValidationFailed exception.

Change-Id: I136a0def74c3edd5513f8acf6847428706ea2c06