Updated git submodules

Project: netvirt master a991d06713483f33b5a37ee2788de947efa03878

BUG 8930 - delete Op VPN interface when deleting external network

Op VPNInterafce is removed in VrfEntryListener when the last
adjacency for the VPNInterface is removed.
The problem is VPN interface for external network doesn't
have any adjacency nor VrfEntry.
As a result, when the external Vpn interface is removed
the Op VpnInstance is not removed as it should.

Fix: Delete the Op VPN interface in VpnInterfaceManager
if the VPN interface to be deleted doesn't have any adjacency

Change-Id: Ice4b9fcb0103c6aff25053cc5b3db3b01311be06
Signed-off-by: Vinh Nguyen <vinh.nguyen@hcl.com>

diff --git a/docs/submodules/netvirt b/docs/submodules/netvirt
index 062f957a7cf83f7a5918b7e842782dacaf865c97..a991d06713483f33b5a37ee2788de947efa03878 160000 (submodule)
--- a/docs/submodules/netvirt
+++ b/docs/submodules/netvirt
@@ -1 +1 @@
-Subproject commit 062f957a7cf83f7a5918b7e842782dacaf865c97
+Subproject commit a991d06713483f33b5a37ee2788de947efa03878