Update git submodules

Update git submodules

* Update docs/submodules/netvirt from branch 'master'
  to ac705c757603b2552656b5df27257096cc768543
  - ELAN: skip remote unicast MACs

    The HWVTEP node data listener has a log message saying “Skipping
    remote ucast macs to parent”, but it doesn’t actually skip. This patch
    adds the apparently appropriate return, and ensures the transactions
    are closed (without using the transaction manager yet, that’s coming
    in a future patch).

    Change-Id: I9a1fa2d5f3edeb4376a60c31e3a2e27b666bb034
    Signed-off-by: Stephen Kitt <skitt@redhat.com>