Adding invalid_property attr to support test code

Moving all base class calls to first line

Adding invalid_property to InvalidObject exception and
invalid_field to UnsupportedField exception.
Modified test code to check these attributes instead of
checking the exception message string.

Also updating NewOrderValidator and VerificationValidator
per bug #1246871

Change-Id: I0776d4a33652ec28c713037c2ef49e35c9b39e54
Implements: blueprint validation-improve-err-msgs