+++ This bug was initially created as a clone of Bug #511273 +++

Registration of Xen guest in an environment where:

1. the xen client's hostname is being set by the dhcp server
2. the address given by the dhcp server is not in dns
3. the address given by the dhcp server is not being inserted into
/etc/hosts on the xen client

these Xen guests get registered to Spacewalk / Satellite with system name
set to "unknown".

Expected results:
Xen guests registered in this environment should be registered with system
name set to respective guest's hostname (as assigned by DHCP).