Update git submodules

Update git submodules

* Update docs/submodules/netvirt from branch 'master'
  to 349cebdee68408c99f38707bfbbbaea80e45ed5c
  - elanmanager: use transaction manager

    This replaces all direct invocations of
    DataBroker::newWriteOnlyTransaction() with calls to a
    ManagedNewTransactionRunner, ensuring all such transactions are
    closed. It also reworks a number of methods to use read/write
    transactions, ensuring that changes are made based on still-relevant
    data.

    This doesn’t address transactions in ElanInterfaceManager.

    Change-Id: Id38c7482cf2403a7751f0faa6134be7374e4a072
    Signed-off-by: Stephen Kitt <skitt@redhat.com>
  - Split up creation/deletion, clean transactions

    This patch splits up creation/deletion methods in
    HwvtepNodeDataListener, avoiding the use of boolean parameters to
    control method behaviour.

    It also ensures the read transactions are closed, and cleans up
    generics as far as possible, along with removing uses of
    ResourceBatchingManager.

    Change-Id: I648be29aed85fed71acb344236ecfa40497f84fc
    Signed-off-by: Stephen Kitt <skitt@redhat.com>