To enable access to libvirtd without sudo:

1. Create a group for privileged users, I called mine libvirt and add your users to it.
2. Create a new file in /etc/polkit-1/rules.d/ i called mine 50-libvirt-group.rules
3. Add the following function:

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polkit.addRule(function(action, subject) {
    if (action.id == "org.libvirt.unix.manage" &&
        subject.isInGroup('libvirt') ) {
        return polkit.Result.YES;
    }
});