Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 4bbcf0d74967a5af6c2cb874d262e45694202be7
  - Merge "Added to support to enabling l2 multicasting"
  - Added to support to enabling l2 multicasting

    updated aai dependency
    Added to support to enabling l2 multicasting for lnterfaces.

    Issue-ID: SO-2914
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@att.com>
    Change-Id: Idf34a41777e23b7171bd09c174830a4eeeb79e4b

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 1b08c1f..4bbcf0d 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 1b08c1ff96623e55200305fc411a8ad03ddd16d1
+Subproject commit 4bbcf0d74967a5af6c2cb874d262e45694202be7