Add global suppression for connectivity problems.

mysql-test/suite/galera/suite.pm

@@ -65,6 +65,7 @@ push @::global_suppressions,
      qr|WSREP: JOIN message from member .* in non-primary configuration. Ignored.|,
      qr(WSREP: Failed to remove page file .*),
      qr(WSREP: wsrep_sst_method is set to 'mysqldump' yet mysqld bind_address is set to .*),
+     qr(WSREP: .*Transport endpoint is not connected.*),
    );
 
 bless { };