[Libvir] [PATCH] #7: Change the virDomainLookup* calls

This changes the three virDomainLookup* calls to make direct calls to the underlying drivers, and to return VIR_ERR_NO_DOMAIN error if the domain is not found. Rich. -- Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903