Recently something changed in the sat schema and we no longer seem to have a
trigger to automatically insert sysdate on RHNERRATA.LAST_MODIFIED.
This is causing a ton of the sat unit tests to fail and is inconsistent with the
other tables in our schema.
A not null constraint was added to the last_modified column:
alter table rhnErrata modify ( last_modified constraint rhn_errata_last_mod_nn
not null );