Revert "pg_dump: Lock all relations, not just plain tables".
Revert
403a3d91c, as well as the followup fix
7f4235032, in all
branches. We need to think a bit harder about what the behavior
of LOCK TABLE on views should be, and there's no time for that
before next week's releases. We'll take another crack at this
later.
Discussion: https://postgr.es/m/16703-
e348f58aab3cf6cc@postgresql.org