Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 8a5c57ffd3d40a8d218179fc285a09c4ec81ee69
  - Merge "PNF WF post instantiation configuration"
  - PNF WF post instantiation configuration

    Fix the PNF registration issue
    Use the applicationEvent to notify about PNF ID

    Issue-ID: SO-1506
    Change-Id: I4c5ebfdd4ed319408ef99e1360c37124688fd7f1
    Signed-off-by: eeginux <henry.xie@est.tech>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index b1ddd02..8a5c57f 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit b1ddd0226b05ed691036affc67924df397809386
+Subproject commit 8a5c57ffd3d40a8d218179fc285a09c4ec81ee69