PostgreSQL 12 changed the log level in client tools, such as
`pg_dump`, which makes some of our tests fail due to different log
level labels.
This change filters and modifies the log level output of `pg_dump` in
earlier PostgreSQL versions to adopt the new PostgreSQL 12 format.
When timescaledb is installed in template1 and a user with only createdb
privileges creates a database, the user won't be able to dump the
database because of lacking permissions. This patch grants the missing
permissions to PUBLIC for pg_dump to succeed.
We need to grant SELECT to PUBLIC for all tables even those not
marked as being dumped because pg_dump will try to access all
tables initially to detect inheritance chains and then decide
which objects actually need to be dumped.
