Fix for rpl000015 that fails if $MYSQL_TCP_PORT is set. The default value for

master_port after a "change master" will be set to the compiled in default value
i.e not always the same as what the master report as it's port number. 

mysql-test/mysql-test-run.pl

@@ -1668,6 +1668,7 @@ sub environment_setup () {
   $ENV{'SLAVE_MYPORT1'}=      $slave->[1]->{'port'};
   $ENV{'SLAVE_MYPORT2'}=      $slave->[2]->{'port'};
   $ENV{'MYSQL_TCP_PORT'}=     $mysqld_variables{'port'};
+  $ENV{'DEFAULT_MASTER_PORT'}= $mysqld_variables{'master-port'};
 
   $ENV{'IM_PATH_SOCK'}=       $instance_manager->{path_sock};
   $ENV{'IM_USERNAME'}=        $instance_manager->{admin_login};

mysql-test/r/rpl000015.result

@@ -8,7 +8,7 @@ Slave_IO_State	Master_Host	Master_User	Master_Port	Connect_Retry	Master_Log_File
 change master to master_host='127.0.0.1';
 show slave status;
 Slave_IO_State	Master_Host	Master_User	Master_Port	Connect_Retry	Master_Log_File	Read_Master_Log_Pos	Relay_Log_File	Relay_Log_Pos	Relay_Master_Log_File	Slave_IO_Running	Slave_SQL_Running	Replicate_Do_DB	Replicate_Ignore_DB	Replicate_Do_Table	Replicate_Ignore_Table	Replicate_Wild_Do_Table	Replicate_Wild_Ignore_Table	Last_Errno	Last_Error	Skip_Counter	Exec_Master_Log_Pos	Relay_Log_Space	Until_Condition	Until_Log_File	Until_Log_Pos	Master_SSL_Allowed	Master_SSL_CA_File	Master_SSL_CA_Path	Master_SSL_Cert	Master_SSL_Cipher	Master_SSL_Key	Seconds_Behind_Master
-#	127.0.0.1	test	MASTER_PORT	7		4	#	#		No	No							0		0	0	#	None		0	No						#
+#	127.0.0.1	test	DEFAULT_MASTER_PORT	7		4	#	#		No	No							0		0	0	#	None		0	No						#
 change master to master_host='127.0.0.1',master_user='root',
 master_password='',master_port=MASTER_PORT;
 show slave status;

mysql-test/t/rpl000015.test

@@ -12,7 +12,7 @@ show slave status;
 
 change master to master_host='127.0.0.1';
 # The following needs to be cleaned up when change master is fixed
---replace_result $MYSQL_TCP_PORT MASTER_PORT
+--replace_result $DEFAULT_MASTER_PORT DEFAULT_MASTER_PORT
 --replace_column 1 # 8 # 9 # 23 # 33 #
 show slave status;
 --replace_result $MASTER_MYPORT MASTER_PORT