MDEV-7178: wsrep* tests fail in buildbot

This is temporal test fixt to avoid concurrent IST for now until
the actual issue https://github.com/codership/galera/issues/204
is fixed.

mysql-test/include/galera_connect.inc

@@ -40,6 +40,9 @@ if ($galera_debug)
   --echo connect($galera_connection_name,127.0.0.1,root,,test,$_galera_port,)
 }
 
+# Temporal solution to avoid concurrent IST MDEV-7178
+--sleep 1
+
 # Open a connection
 --connect($galera_connection_name,127.0.0.1,root,,test,$_galera_port,)
 

mysql-test/suite/wsrep/suite.pm

@@ -32,6 +32,7 @@ push @::global_suppressions,
      qr(WSREP: Gap in state sequence. Need state transfer.),
      qr(WSREP: Failed to prepare for incremental state transfer: .*),
      qr(WSREP: Releasing seqno [0-9]* before [0-9]* was assigned.),
+     qr(WSREP: SYNC message from member 1 in non-primary configuration. Ignored.),
    );