Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to e2708cba9e8190fd022a87d962721eeea2b1a2e3
  - Fix for MDONS create and delete flow

    Added service-name update OTN service for Create flow
    Added new request format for OTN service Delete flow

    Change-Id: Iea3362c2a57a376f181de813158462390aaf27e3
    Issue-ID: SO-2460
    Signed-off-by: Srinivasan Ramanathan <srinivasan.ramanathan2@us.fujitsu.com>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 3b6caf9..e2708cb 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 3b6caf9cc8e1341ea000cb55ae277f622c816dda
+Subproject commit e2708cba9e8190fd022a87d962721eeea2b1a2e3