Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 9b78caf92e4a362850a242f04871644dafc20f62
  - Merge "Add ChangeModelVnfBB and"
  - Add ChangeModelVnfBB and

    Add ChangeModelVnfBB and ChangeModelServiceInstanceBB as part of
    fallout for vfmodule replace flow
    Update to execute the ChangeModelVnfBB and ChangeModelServiceInstanceBB
    flows for fallout in vfmodule replace flow
    Update the logic to the ChangeBB  list

    Issue-ID: SO-2976
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@att.com>
    Change-Id: Id50d7ecd2abdd18178fbe2566c247e0c57b54353

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index a3b0c74..9b78caf 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit a3b0c74345d2dbf981d49493ef498e28e867a144
+Subproject commit 9b78caf92e4a362850a242f04871644dafc20f62