[XM] When two or more domain parameters are given, the xm reboot

command doesn't give a command error. This problem is also 
included in the xm shutdown command. 

This patch checks on domain parameter. If two or more domain 
parameters are given, the command error occurs.

Signed-off-by: Masaki Kanno <kanno.masaki@jp.fujitsu.com>

tools/python/xen/xm/shutdown.py

@@ -92,7 +92,8 @@ def main_all(opts, args):
     shutdown(opts, None, mode, opts.vals.wait)
 
 def main_dom(opts, args):
-    if len(args) < 1: opts.err('Missing domain')
+    if len(args) == 0: opts.err('No domain parameter given')
+    if len(args) >  1: opts.err('No multiple domain parameters allowed')
     dom = args[0]
     mode = shutdown_mode(opts)  
     shutdown(opts, [ dom ], mode, opts.vals.wait)