Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 1ad915ff0a4678d6a5f918f39ea42c18b620f7bb
  - Add SO Update Check if SDC activities deployment end point server Up for custom worlflows

    Make changes to verify if SDC activities deployment
    end point(mso.asdc.config.activity.endpoint) server up
    for custom workflows
    Issue-ID: SO-2348
    Signed-off-by: Bonkur, Venkat (vb8416) <vb8416@att.com>
    Change-Id: I3b90b6d8e95681a685b23dfaa2f65596532e5b0e

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index e288bed..1ad915f 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit e288bedf6a7b83c6127cbb1bc4281084cdbc218e
+Subproject commit 1ad915ff0a4678d6a5f918f39ea42c18b620f7bb