BUG#44270: Post-push fix

The test case added failed sporadically on PB. This is due to the
fact that the user thread in some cases is waiting for slave IO
to stop and then check the error number. Thence, sometimes the
user thread would race for the error number with IO thread.

This post push fix addresses this by replacing the wait for slave
io to stop with a wait for slave io error (as it seems it was
added in 6.0 also after patch on which this is based was
pushed). This implied backporting wait_for_slave_io_error.inc
from 6.0 also.

mysql-test/extra/rpl_tests/rpl_reset_slave.test

@@ -58,7 +58,7 @@ echo *** errno must be zero: $last_io_errno ***;
 
 change master to master_user='impossible_user_name';
 start slave;
-source include/wait_for_slave_io_to_stop.inc;
+source include/wait_for_slave_io_error.inc;
 let $last_io_errno= query_get_value(SHOW SLAVE STATUS, Last_IO_Errno, 1);
 --disable_query_log
 eval SELECT $last_io_errno > 0 as ONE;
@@ -79,7 +79,7 @@ let $last_io_error= query_get_value(SHOW SLAVE STATUS, Last_IO_Error, 1);
 source include/stop_slave.inc;
 change master to master_user='impossible_user_name';
 start slave;
-source include/wait_for_slave_io_to_stop.inc;
+source include/wait_for_slave_io_error.inc;
 let $last_io_errno= query_get_value(SHOW SLAVE STATUS, Last_IO_Errno, 1);
 --disable_query_log
 eval SELECT $last_io_errno > 0 as ONE;

mysql-test/include/wait_for_slave_io_error.inc

+# ==== Purpose ====
+#
+# Waits until the IO thread of the current connection has got an
+# error, or until a timeout is reached.
+#
+# ==== Usage ====
+#
+# source include/wait_for_slave_io_error.inc;
+#
+# Parameters to this macro are $slave_timeout and
+# $slave_keep_connection. See wait_for_slave_param.inc for
+# descriptions.
+
+let $old_slave_param_comparison= $slave_param_comparison;
+
+let $slave_param= Last_IO_Errno;
+let $slave_param_comparison= !=;
+let $slave_param_value= 0;
+let $slave_error_message= Failed while waiting for slave to produce an error in its sql thread;
+source include/wait_for_slave_param.inc;
+let $slave_error_message= ;
+
+let $slave_param_comparison= $old_slave_param_comparison;