[libvirt] [v2 0/3] Fixes related to the IP address learning thread

The following set of patches are primarily related to the thread learning the IP address of a VM and deal with: - ebtables cleanup before applying basic filtering rules that are active while the IP address is detected - shutting down all traffic in case the filtering rules could not be applied by the thread - serialization of the teardown of eb/ip/ip6tables rules to occurr after the IP address learning thread has terminated - not to apply or tear any eb/ip/ip6tables rules of a VM's interface while the IP address learning thread is active. This may be due to a filter being updated concurrently using for exampe 'virsh define/edit'. Regards, Stefan