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

Proper resubmission -- sorry for the noise. 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 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 - no to apply or tear any eb/ip/ip6tables rules while the IP address learning thread is active Regards, Stefan