When a user does not have ownership on a relation, then specific log
messages are generated.  This new test suite adds coverage for all the
possible log messages generated, which will be useful to check the
consistency of any refactoring related to ownership checks for relations
vacuumed or analyzed.

Author: Michael Paquier
Reviewed-by: Nathan Bossart
Discussion: https://postgr.es/m/20180812222142.GA6097@paquier.xyz