Update git submodules

* Update docs/submodules/netvirt from branch 'master'
  to 4e97f4dcef6e58b48ab69325500e41b48960f527
  - ACL: use transaction manager for write transactions

    This replaces all direct invocations of
    DataBroker::newWriteOnlyTransaction() with calls to a
    ManagedNewTransactionRunner, ensuring all such transactions are
    closed.

    Change-Id: Id148f5f5dc1bee69805e096136d509f4f6c3209a
    Signed-off-by: Stephen Kitt <skitt@redhat.com>

diff --git a/docs/submodules/netvirt b/docs/submodules/netvirt
index 2ba480ccf176bd424a7c0fec3013a958ce9c5d84..4e97f4dcef6e58b48ab69325500e41b48960f527 160000 (submodule)
--- a/docs/submodules/netvirt
+++ b/docs/submodules/netvirt
@@ -1 +1 @@
-Subproject commit 2ba480ccf176bd424a7c0fec3013a958ce9c5d84
+Subproject commit 4e97f4dcef6e58b48ab69325500e41b48960f527