test: Fix MessageHook test on PostgreSQL 9.3
test: Fix MessageHook test on PostgreSQL 9.3

PostgreSQL 9.3 no longer raises a NOTICE about automatic creation of an
implicit index when PRIMARY KEY is declared (it raises a DEBUG1
instead).  Switch the test to an attempt to REINDEX a table without
indexes, which is a more consistent NOTICE (this has been a WARNING
before PostgreSQL 7.4).

python-postgres/fe,python-postgres/fe