Extend test case to cover old alarm style conversion

There is a related change https://review.openstack.org/#/c/74462/
that fixs bug #1281181. This change extends an existing test case to run
on db2 enigne to cover that bug

Change-Id: Ib6894c774ec3fe322a2b8a75cc036cedcee5ce43
Merge "Extend test case to cover old alarm style conversion"