[libvirt] closing old maint branches [was: [v0.9.12-maint 0/8] Backport changes for CVE-2013-6458 to v0.9.12-maint]

Is anyone still using v0.9.11-maint? The CVE extends back to 0.9.8, so we could argue that we should either fix the 0.9.11 branch, or add another commit to the branch that explicitly marks it as end-of-life because no one appears to be relying on it. Fedora 18 is now end-of-life, so from Fedora's perspective, I only care about 0.10.2 (RHEL and CentOS 6), 1.0.5 (F19), 1.1.3 (F20) and soon 1.2.1 (rawhide), although I didn't mind touching all the intermediate branches on my way down to 0.10.2. RHEL 5 is also vulnerable to CVE-2013-6458, but as we don't have an upstream v0.8.2-maint branch (thank goodness!), that's something for Red Hat to worry about.