Test getSharedConnection handles dead connections
Test getSharedConnection handles dead connections

If a test does something that kills a connection, it previously
would break all subsequent tests that used the shared connection.
It no longer does.

jackc/pgx,rsto/pgx,plopik/pgx,jackc/pgx,silviucm/pgx,jonasi/pgx,jackc/pgx,kelvich/pgx,josephglanville/pgx,axsy-dev/tern,silviucm/pgx,jackc/pgx,plopik/pgx,jackc/tern-deb,plopik/pgx,deoxxa/pgx,jackc/tern,silviucm/pgx