Regression test: inherit.
Moved it from parallel group of tests to make it run sequentially.
It used to give a random but harmless difference in the output in
one of the explain plan outputs.
Always schema-qualify object names in the deparsed remote query.
Temporarily set search_path to NIL, so as to have all object names
schema-qualified. This was required so that the same deparsed query
works even when search_path is changed in between two executes
of a prepared statement.
This fixes a regression caused in test plancache.sql