Fixed bugs in client/mysqltest.c which made lots of "connect" commands in tests fail.

client/mysqltest.c:
  Fixed crash bug in debug mode and make sure q->last_argument is set right
  so that check_eol_junk() will work again.

client/mysqltest.c

@@ -2183,7 +2183,7 @@ int do_connect(struct st_query *q)
   VAR *var_port, *var_sock;
 
   DBUG_ENTER("do_connect");
-  DBUG_PRINT("enter",("connect: %s",p));
+  DBUG_PRINT("enter",("connect: %s", q->first_argument));
 
   /* Make a copy of query before parsing, safe_get_param will modify */
   if (!(con_buf= my_strdup(q->first_argument, MYF(MY_WME))))
@@ -2257,7 +2257,8 @@ int do_connect(struct st_query *q)
       die("Illegal option to connect: %s", con_options);
     con_options= str;
   }
-  q->last_argument= p;
+  /* Note: 'p' is pointing into the copy 'con_buf' */
+  q->last_argument= q->first_argument + (p - con_buf);
 
   if (next_con == cons_end)
     die("Connection limit exhausted - increase MAX_CONS in mysqltest.c");