Add more disabled tests and one ignored warning.

mysql-test/suite/galera/disabled.def

@@ -40,4 +40,7 @@ galera_ssl_upgrade : MDEV-13549 Galera test failures
 mysql-wsrep#33 : MDEV-13549 Galera test failures
 galera_var_auto_inc_control_on : MDEV-13549 Galera test failures
 MW-44 : MDEV-13549 Galera test failures
-galera_var_retry_autocommit : MDEV-13549 Galera test failures
\ No newline at end of file
+galera_var_retry_autocommit : MDEV-13549 Galera test failures
+pxc-421 : MDEV-13549 Galera test failures
+lp1376747-2 : MDEV-13549 Galera test failures
+lp1376747 : MDEV-13549 Galera test failures
\ No newline at end of file

mysql-test/suite/galera/suite.pm

@@ -74,6 +74,7 @@ push @::global_suppressions,
      qr|WSREP: Unsupported protocol downgrade: incremental data collection disabled. Expect abort.|,
      qr(WSREP: Action message in non-primary configuration from member [0-9]*),
      qr(WSREP: discarding established .*),
+     qr(WSREP: gcs\/src\/gcs_core.cpp:core_handle_uuid_msg\(\):.*: STATE EXCHANGE: failed for: .*: .* \(Transport endpoint is not connected\)),
    );