Update git submodules

* Update docs/submodules/netvirt from branch 'master'
  to 37224170436fc34cdd01c8ae69910b01e159aa9a
  - NETVIRT-1068: Upstreaming fixes

    Issue-1: When VpnInterface has a secondary adjacency like invisible ip, if tunnel
    EP is deleted , VpnInterface Op DS is updated with empty nexthoplist.
    During this time , invisible ip goes missing from VpnInterface Op DS due
    to MDSAL.syncwrite() being done in updateVpnInterfaceOnTepDelete. Another
    fix being done here is , invisible ip FIB entry is updated with empty
    nexthop and route is withdrawn/advertized to BGP

    Issue-2:  prefix-A part of subnet-A/network-A/VPN-A. The refcount for
    prefix-A is 1. When VPN-B is importing from VPN-A , refcount is 2. But
    when prefix-B part of VPN-B is deleted , refcount was not decremented.
    For self-imported routes , when the prefix is deleted , refcount is
    decremented.

    Change-Id: I2cabeaa1ae23e356b2d17a527e9bbc6a5b21afd0
    Signed-off-by: HANAMANTAGOUD V Kandagal <hanamantagoud.v.kandagal@ericsson.com>

diff --git a/docs/submodules/netvirt b/docs/submodules/netvirt
index 1c3ae785f84659c2ad7c6f795a8990c8ee00884e..37224170436fc34cdd01c8ae69910b01e159aa9a 160000 (submodule)
--- a/docs/submodules/netvirt
+++ b/docs/submodules/netvirt
@@ -1 +1 @@
-Subproject commit 1c3ae785f84659c2ad7c6f795a8990c8ee00884e
+Subproject commit 37224170436fc34cdd01c8ae69910b01e159aa9a