Galera 3 versions of the result files recorded.

mysql-test/suite/galera_3nodes/r/galera_ipv6_mariabackup_section.result

+SELECT VARIABLE_VALUE LIKE '%[::1]%' FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_incoming_addresses';
+VARIABLE_VALUE LIKE '%[::1]%'
+1
+SELECT VARIABLE_VALUE = 3 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size';
+VARIABLE_VALUE = 3
+1
+SET GLOBAL wsrep_provider_options='gmcast.isolate=1';
+CREATE TABLE t1 (f1 INTEGER) ENGINE=InnoDB;
+INSERT INTO t1 VALUES (1);
+SET GLOBAL wsrep_provider_options='gmcast.isolate=0';
+SELECT COUNT(*) = 1 FROM t1;
+COUNT(*) = 1
+1
+DROP TABLE t1;
+include/assert_grep.inc [Streaming the backup to joiner at \[::1\]]
+include/assert_grep.inc [async IST sender starting to serve tcp://\[::1\]:]
+include/assert_grep.inc [IST receiver addr using tcp://\[::1\]]
+include/assert_grep.inc [Prepared IST receiver, listening at: tcp://\[::1\]]

mysql-test/suite/galera_3nodes/r/galera_ipv6_rsync_section.result

-connection node_2;
-connection node_1;
 SELECT VARIABLE_VALUE LIKE '%[::1]%' FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_incoming_addresses';
 VARIABLE_VALUE LIKE '%[::1]%'
 1
 SELECT VARIABLE_VALUE = 3 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size';
 VARIABLE_VALUE = 3
 1
-connection node_2;
 SET GLOBAL wsrep_provider_options='gmcast.isolate=1';
-connection node_1;
 CREATE TABLE t1 (f1 INTEGER) ENGINE=InnoDB;
 INSERT INTO t1 VALUES (1);
-connection node_2;
 SET GLOBAL wsrep_provider_options='gmcast.isolate=0';
 SELECT COUNT(*) = 1 FROM t1;
 COUNT(*) = 1

mysql-test/suite/galera_3nodes/t/galera_ipv6_mariabackup_section.test

@@ -39,30 +39,31 @@ DROP TABLE t1;
 --let $assert_only_after = CURRENT_TEST
 
 # The SSTs happen when nodes are started first time
---let $assert_count = 2
+--let $assert_count= 2
 --let $assert_text = Streaming the backup to joiner at \[::1\]
 --let $assert_select = Streaming the backup to joiner at \[::1\]
 --source include/assert_grep.inc
 
-# There will be 3 ISTs donated from node_1 in Galera 4.
+# There will be 1 ISTs donated from node_1 in Galera 3.
 # Two first happen at the initial startup to populate the certification
 # index. The third one is from the IST which happens during the actual test.
---let $assert_count = 3
+--let $assert_count= 1
 --let $assert_text = async IST sender starting to serve tcp://\[::1\]:
 --let $assert_select = async IST sender starting to serve tcp://\[::1\]:
 --source include/assert_grep.inc
 
+--connection node_2
 --let $assert_file = $MYSQLTEST_VARDIR/log/mysqld.2.err
+--let $assert_only_after = CURRENT_TEST
 
-# There are two ISTs on joiner, the first at the initial startup, the second
-# during the actual test.
---let $assert_count = 2
+# There is one ISTs on joiner at Galera 3.
+--let $assert_count= 1
 --let $assert_text = IST receiver addr using tcp://\[::1\]
 --let $assert_select = IST receiver addr using tcp://\[::1\]
 --source include/assert_grep.inc
 
-# The receiver expects seqnos 3-6 only once.
---let $assert_count = 1
---let $assert_text = Prepared IST receiver for 3-6, listening at: tcp://\[::1\]
---let $assert_select = Prepared IST receiver for 3-6, listening at: tcp://\[::1\]
+# There will be only one Prepared IST and in Galera 3 segnos are not printed
+--let $assert_count= 1
+--let $assert_text = Prepared IST receiver, listening at: tcp://\[::1\]
+--let $assert_select = Prepared IST receiver, listening at: tcp://\[::1\]
 --source include/assert_grep.inc