Remove Ex versions of Query and QueryRow

Always require context and prepend options to arguments if necessary.

replication_test.go

@@ -17,7 +17,7 @@ import (
 // This function uses a postgresql 9.6 specific column
 func getConfirmedFlushLsnFor(t *testing.T, conn *pgx.Conn, slot string) string {
 	// Fetch the restart LSN of the slot, to establish a starting point
-	rows, err := conn.Query(fmt.Sprintf("select confirmed_flush_lsn from pg_replication_slots where slot_name='%s'", slot))
+	rows, err := conn.Query(context.Background(), fmt.Sprintf("select confirmed_flush_lsn from pg_replication_slots where slot_name='%s'", slot))
 	if err != nil {
 		t.Fatalf("conn.Query failed: %v", err)
 	}