Fix ref to SERVICE_MODEL

Network model dump incorrectly refers to SERVICE_MODEL in lower case.
Fixed the reference, but also added script to remove the
offending foreign key (FK_NETWORK_MODEL) to be consistent with
workaround used throughout Beijing testing.  For Casablanca,
will remove call to that script and test using fixed foreign key.

Change-Id: I5ce5d99d6c217c4bd713268a232c902f2d849c62
Issue-ID: SDNC-291
Signed-off-by: Timoney, Dan (dt5972) <dt5972@att.com>
Former-commit-id: 1df1b909791232ac15eb682328d27d736443f877