BUG#12416700: RPL_SHOW_SLAVE_HOSTS FAILS SPORADICALLY (TIMEOUT

              IN WAIT_SHOW_CONDITION) 

There was a typo in the name of one of the parameters to the
include file wait_show_condition. The parameter name was being
set to "connection" instead of "condition".

We fix this typo, improve one instruction in the test case and
deploy parameter checks inside wait_show_condition.inc.

mysql-test/include/wait_show_condition.inc

@@ -31,6 +31,21 @@
 # Created: 2009-02-18 mleich
 #
 
+if (!$condition)
+{
+  --die ERROR IN TEST: the "condition" variable must be set
+}
+
+if (!$field)
+{
+  --die ERROR IN TEST: the "field" variable must be set
+}
+
+if (!$show_statement)
+{
+  --die ERROR IN TEST: the "show_statement" variable must be set
+}
+
 let $max_run_time= 30;
 if ($wait_timeout)
 {

mysql-test/suite/rpl/r/rpl_show_slave_hosts.result

@@ -8,8 +8,7 @@ SHOW SLAVE HOSTS;
 Server_id	Host	Port	Master_id
 3	slave2	DEFAULT_PORT	1
 2		SLAVE_PORT	1
-STOP SLAVE IO_THREAD;
-include/wait_for_slave_io_to_stop.inc
+include/stop_slave_io.inc
 SHOW SLAVE HOSTS;
 Server_id	Host	Port	Master_id
 2		SLAVE_PORT	1

mysql-test/suite/rpl/t/rpl_show_slave_hosts.test

@@ -23,14 +23,13 @@ connection master;
 let $show_statement= SHOW SLAVE HOSTS;
 let $field= Server_id;
 # 3 is server_id of slave2.
-let $connection= ='3';
+let $condition= ='3';
 source include/wait_show_condition.inc;
 --replace_result $SLAVE_MYPORT SLAVE_PORT $DEFAULT_MASTER_PORT DEFAULT_PORT
 SHOW SLAVE HOSTS;
 
 connection slave2;
-STOP SLAVE IO_THREAD;
-source include/wait_for_slave_io_to_stop.inc;
+--source include/stop_slave_io.inc
 
 connection master;
 let $show_statement= SHOW SLAVE HOSTS;