conf: Replace virDomainDiskSourceAuthParse by an XPath query
conf: Replace virDomainDiskSourceAuthParse by an XPath query

Remove the rather bulky function in favor of an XPath query.

Signed-off-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>

libvirt/libvirt,nertpinx/libvirt,eskultety/libvirt,olafhering/libvirt,eskultety/libvirt,jfehlig/libvirt,libvirt/libvirt,zippy2/libvirt,nertpinx/libvirt,eskultety/libvirt,libvirt/libvirt,fabianfreyer/libvirt,olafhering/libvirt,zippy2/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,zippy2/libvirt,andreabolognani/libvirt,jardasgit/libvirt,jardasgit/libvirt,crobinso/libvirt,crobinso/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,nertpinx/libvirt,zippy2/libvirt,crobinso/libvirt,fabianfreyer/libvirt,crobinso/libvirt,jfehlig/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,eskultety/libvirt,andreabolognani/libvirt,olafhering/libvirt,eskultety/libvirt,andreabolognani/libvirt,jfehlig/libvirt,jardasgit/libvirt,libvirt/libvirt,jfehlig/libvirt,olafhering/libvirt,jardasgit/libvirt,jardasgit/libvirt