xend: Update VCPUs_live

XendConfig.py said about VCPUs_live as follows.

 -- the number of VCPUs currently up, as reported by Xen.

But the value of VCPUs_live always is 1 till xm vcpu-set get
executed.  This patch updates VCPUs_live by using online_vcpus.

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

tools/python/xen/xend/XendConfig.py

@@ -431,6 +431,8 @@ class XendConfig(dict):
     def _vcpus_sanity_check(self):
         if 'VCPUs_max' in self and 'vcpu_avail' not in self:
             self['vcpu_avail'] = (1 << self['VCPUs_max']) - 1
+        if 'online_vcpus' in self:
+            self['VCPUs_live'] = self['online_vcpus']
 
     def _uuid_sanity_check(self):
         """Make sure UUID is in proper string format with hyphens."""