Cast maxmem to int before computation

Reported in L3 bnc#732782

    From: Dario Abatianni <dabatianni@novell.com>

Index: xen-4.2.0-testing/tools/python/xen/xm/xenapi_create.py
===================================================================
--- xen-4.2.0-testing.orig/tools/python/xen/xm/xenapi_create.py
+++ xen-4.2.0-testing/tools/python/xen/xm/xenapi_create.py
@@ -764,7 +764,7 @@ class sxp2xml:
 
         if get_child_by_name(config, "maxmem"):
             memory.attributes["static_max"] = \
-               str(int(get_child_by_name(config, "maxmem")*1024*1024))
+               str(int(get_child_by_name(config, "maxmem"))*1024*1024)
 
         vm.appendChild(memory)