fix for im_life_cycle test: replace im instance port number with a constant string.

The lack of this --replace resulted in the test failing on all build hosts

mysql-test/r/im_life_cycle.result

@@ -21,7 +21,7 @@ instance_name	status	version
 mysqld2	online	VERSION
 SHOW VARIABLES LIKE 'port';
 Variable_name	Value
-port	9312
+port	IM_MYSQLD1_PORT
 STOP INSTANCE mysqld2;
 SHOW INSTANCES;
 instance_name	status

mysql-test/t/im_life_cycle.imtest

@@ -46,6 +46,7 @@ SHOW INSTANCE STATUS mysqld2;
 --connect (mysql_con,localhost,root,,mysql,$IM_MYSQLD1_PORT,$IM_MYSQLD1_SOCK)
 --connection mysql_con
 
+--replace_result $IM_MYSQLD1_PORT IM_MYSQLD1_PORT
 SHOW VARIABLES LIKE 'port';
 
 --connection default