jdbc: metadata: verify DatabaseMetaData.all* methods

[Totktonada]

DatabaseMetaData.

Methods:

• allProceduresAreCallable
• allTablesAreSelectable

It seems these methods should both return true or false and it does not matter
much.

• mysql-connector-j returns false;
• mariadb-connector-j returns true;
• pgjdbc returns true;