[Libvir] [PATCH] virDomainLookup* functions raise VIR_ERR_NO_DOMAIN if the domain doesn't exist

["Richard W.M. Jones" <rjones redhat com>]

The patches that I'm going to follow up with change virDomainLookup* 
functions so that they raise VIR_ERR_NO_DOMAIN where a domain doesn't 
exist (but there is no other error), else raise some other error where 
there's an actual error occuring.

This will allow wrappers in other languages to distinguish the three 
cases found / not found / error.

Rich.

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