This patch updates the CPU field in xm list for multi-vcpu domains.

When a dom runs on multiple physical cpus, the CPU field doesn't have
much meaning.  The suggested fix was to replace the value with '-'.  
Signed-off-by: Ryan Harper <ryanh@us.ibm.com>

tools/python/xen/xm/main.py

@@ -397,7 +397,7 @@ class ProgList(Prog):
             d['dom'] = int(sxp.child_value(info, 'id', '-1'))
             d['name'] = sxp.child_value(info, 'name', '??')
             d['mem'] = int(sxp.child_value(info, 'memory', '0'))
-            d['cpu'] = int(sxp.child_value(info, 'cpu', '0'))
+            d['cpu'] = str(sxp.child_value(info, 'cpu', '0'))
             d['vcpus'] = int(sxp.child_value(info, 'vcpus', '0'))
             d['state'] = sxp.child_value(info, 'state', '??')
             d['cpu_time'] = float(sxp.child_value(info, 'cpu_time', '0'))
@@ -406,12 +406,14 @@ class ProgList(Prog):
                 d['port'] = sxp.child_value(console, 'console_port')
             else:
                 d['port'] = ''
+            if d['vcpus'] > 1:
+                d['cpu'] = '-'
             if ((int(sxp.child_value(info, 'ssidref', '0'))) != 0):
                 d['ssidref1'] =  int(sxp.child_value(info, 'ssidref', '0')) & 0xffff
                 d['ssidref2'] = (int(sxp.child_value(info, 'ssidref', '0')) >> 16) & 0xffff
-                print ("%(name)-16s %(dom)3d  %(mem)7d  %(cpu)3d  %(vcpus)5d   %(state)5s  %(cpu_time)7.1f     %(port)4s    s:%(ssidref2)02x/p:%(ssidref1)02x" % d)
+                print ("%(name)-16s %(dom)3d  %(mem)7d  %(cpu)3s  %(vcpus)5d   %(state)5s  %(cpu_time)7.1f     %(port)4s    s:%(ssidref2)02x/p:%(ssidref1)02x" % d)
             else:
-                print ("%(name)-16s %(dom)3d  %(mem)7d  %(cpu)3d  %(vcpus)5d   %(state)5s  %(cpu_time)7.1f     %(port)4s" % d)
+                print ("%(name)-16s %(dom)3d  %(mem)7d  %(cpu)3s  %(vcpus)5d   %(state)5s  %(cpu_time)7.1f     %(port)4s" % d)
 
     def show_vcpus(self, doms):
         print 'Name              Id  VCPU  CPU  CPUMAP'