Medium: VirtualDomain: Properly detect defined lxc domains

Defining a already defined lxc domains prints out a different
error message than kvm domains for some reason. This patch
matchs both.
Merge pull request #206 from davidvossel/master

Medium: VirtualDomain: Properly detect defined lxc domains
Low: spec: Support for fedora 19
Low: build: Make IPV6ADDR build conditionally depending on cluster glue devel
Merge pull request #215 from davidvossel/spec_fedora19_update

Updates to spec and configure.ac for building against fedora 19