A fix and a test case for Bug#17843 "Certain stored procedures fail to

run at startup"

The server returned an error when trying to execute init-file with a 
stored procedure that could return multiple result sets to the client. 
A stored procedure can return multiple result sets if it contains 
PREPARE, SELECT, SHOW and similar statements.
   
The fix is to set client_capabilites|=CLIENT_MULTI_RESULTS in
sql_parse.cc:handle_bootstrap(). There is no "client" really, so 
nothing is ever sent. This makes init-file feature behave consistently: 
the prepared statements that can be called directly in the init-file 
can be used in a stored procedure too.

Re-committed the patch originally submitted by Per-Erik after review.

sql/sql_parse.cc

@@ -1250,6 +1250,12 @@ pthread_handler_t handle_bootstrap(void *arg)
   thd->version=refresh_version;
   thd->security_ctx->priv_user=
     thd->security_ctx->user= (char*) my_strdup("boot", MYF(MY_WME));
+  /*
+    Make the "client" handle multiple results. This is necessary
+    to enable stored procedures with SELECTs and Dynamic SQL
+    in init-file.
+  */
+  thd->client_capabilities|= CLIENT_MULTI_RESULTS;
 
   buff= (char*) thd->net.buff;
   thd->init_for_queries();