Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 8c3d56d72b36ea3be72b6a2862f37553d9cc3776
  - Merge "Added support for volume group request to"
  - Added support for volume group request to

    Added support for volume group request to indicate whether the volume
    group existed, etc.

    Issue-ID: SO-2770
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@att.com>
    Change-Id: I614926ad33220734133afd84bd8d0fedc8f6e6d6

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 46aa503..8c3d56d 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 46aa5031d876e715335d3c55c479aca3901f9429
+Subproject commit 8c3d56d72b36ea3be72b6a2862f37553d9cc3776