Paper over pg_upgrade test failure

The publication test didn't drop all the publications it was creating
when it was probably intending to do that.  There is still a bug with
dependency tracking in there, but this should at least quiet down the
build farm.

Author: petere

src/test/regress/expected/publication.out

@@ -150,6 +150,7 @@ DROP TABLE testpub_tbl1;
 
 DROP PUBLICATION testpub_default;
 DROP PUBLICATION testpib_ins_trunct;
+DROP PUBLICATION testpub_fortbl;
 DROP SCHEMA pub_test CASCADE;
 NOTICE:  drop cascades to table pub_test.testpub_nopk
 RESET SESSION AUTHORIZATION;

src/test/regress/sql/publication.sql

@@ -75,6 +75,7 @@ DROP TABLE testpub_tbl1;
 
 DROP PUBLICATION testpub_default;
 DROP PUBLICATION testpib_ins_trunct;
+DROP PUBLICATION testpub_fortbl;
 
 DROP SCHEMA pub_test CASCADE;