High: VirtualDomain: Fixes parsing domain name from xml file.

If the domain xml is not generated by virsh, it is possible
VirtualDomain will not be able to detect the domain's name
from the xml file.  This is a result of the parsing command
not taking into account trailing whitespace characters.
Merge pull request #374 from davidvossel/virtdomain-parse-fix

High: VirtualDomain: Fixes parsing domain name from xml file.