fix show_relaylog_events.inc to work for multisource

and fix SHOW RELAYLOG 'src_name' EVENTS to respect src_name

mysql-test/include/show_events.inc

@@ -15,7 +15,19 @@
 --let $statement=show BINLOG events
 if ($is_relay_log)
 {
-  --let $statement=show relaylog events
+  if ($master_name)
+  {
+    let _master_name='$master_name';
+  }
+  if (!$master_name)
+  {
+    let _master_name=`select @@default_master_connection`;
+    if ($_master_name)
+    {
+      let _master_name='$_master_name';
+    }
+  }
+  --let $statement=show relaylog $_master_name events
 }
 
 if ($binlog_file)
@@ -25,7 +37,7 @@ if ($binlog_file)
   {
     if ($is_relay_log)
     {
-      --let $_binlog_file= query_get_value(SHOW SLAVE STATUS, Relay_Log_File, 1)
+      --let $_binlog_file= query_get_value(SHOW SLAVE $_master_name STATUS, Relay_Log_File, 1)
     }
     if (!$is_relay_log)
     {

mysql-test/include/show_relaylog_events.inc

 ##############################################################################
 # Show relay log events 
 #
-# Useage: 
+# Usage:
 # let $binlog_file= slave-relay-bin.000002; 
 # let $binlog_start= 106; 
 # let $binlog_limit= 1, 3; 
+# let $master_name= master1;
 # source include/show_relaylog_events.inc;
 #
 # It shows the first relay log file if $binlog_file is not given. 

sql/sql_repl.cc

@@ -3800,6 +3800,7 @@ bool mysql_show_binlog_events(THD* thd)
   int old_max_allowed_packet= thd->variables.max_allowed_packet;
   Master_info *mi= 0;
   LOG_INFO linfo;
+  LEX_MASTER_INFO *lex_mi= &thd->lex->mi;
 
   DBUG_ENTER("mysql_show_binlog_events");
 
@@ -3821,10 +3822,12 @@ bool mysql_show_binlog_events(THD* thd)
   }
   else  /* showing relay log contents */
   {
+    if (!lex_mi->connection_name.str)
+      lex_mi->connection_name= thd->variables.default_master_connection;
     mysql_mutex_lock(&LOCK_active_mi);
     if (!master_info_index ||
         !(mi= master_info_index->
-          get_master_info(&thd->variables.default_master_connection,
+          get_master_info(&lex_mi->connection_name,
                           Sql_condition::WARN_LEVEL_ERROR)))
     {
       mysql_mutex_unlock(&LOCK_active_mi);
@@ -3835,7 +3838,6 @@ bool mysql_show_binlog_events(THD* thd)
 
   if (binary_log->is_open())
   {
-    LEX_MASTER_INFO *lex_mi= &thd->lex->mi;
     SELECT_LEX_UNIT *unit= &thd->lex->unit;
     ha_rows event_count, limit_start, limit_end;
     my_off_t pos = MY_MAX(BIN_LOG_HEADER_SIZE, lex_mi->pos); // user-friendly