Updated git submodules

Project: netvirt master 0520c3c10436047d61337bcfa0f7bdd7584beae7

Restrict NeutronvpnUtils.read

As a first step towards removing NeutronvpuUtils.read, replace all
external uses with SingleTransactionDataBroker.syncReadOptional and
adjust the exception handling accordingly (which also allows us to
clean up a number of disabled Checkstyle warnings).

Change-Id: Ibad4aa194657cdb8c56ccd993c9182dbf4225f02
Signed-off-by: Stephen Kitt <skitt@redhat.com>

diff --git a/docs/submodules/netvirt b/docs/submodules/netvirt
index 0280ea39a7e3b41d1275b1f845183566aec8b661..0520c3c10436047d61337bcfa0f7bdd7584beae7 160000 (submodule)
--- a/docs/submodules/netvirt
+++ b/docs/submodules/netvirt
@@ -1 +1 @@
-Subproject commit 0280ea39a7e3b41d1275b1f845183566aec8b661
+Subproject commit 0520c3c10436047d61337bcfa0f7bdd7584beae7