Check if joining to pg_authid is necessary for listing materialized views

[jng]

#943 added support for materialized views. However the SQL to query for these materialized views includes a join to the pg_authid table/view which seems unnecessary as the joined table is not part of any output columns or where clauses.

For the purpose of attack surface reduction, we should check if this join is even necessary and remove it if such a join is not necessary.

[jng]

In 7953:

Remove join to pg_authid in table/view listing query. It does not appear to be necessary and our materialized view test still passes.

Fixes #949

[jng]

In 7954:

Remove join to pg_authid in table/view listing query. It does not appear to be necessary and our materialized view test still passes.

Fixes #949

[jng]

In 7955:

Merged revision(s) 7952-7954 from trunk:
Merged revision(s) 7951 from branches/4.1:
#893: Refine the vndr_info reporting for MySQL driver to report the correct version number for MariaDB, allowing the full spatial capability suite to light up for the MySQL provider when connecting to MariaDB
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Remove join to pg_authid in table/view listing query. It does not appear to be necessary and our materialized view test still passes.

Fixes #949
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