Update git submodules

* Update docs/submodules/so.git from branch 'elalto'
  to 6cf18e59f1f7fc94bcae27785dc9a17008324fa8
  - Address NullPointerException with apih healthcheck endpoint

    Facing NullPointerException with apih healthcheck endpoint
    with elalto branch. Brittany has addressed this issue
    with master branch and this change brings in those
    changes with elalto branch
    This is a squashed commit cherry picked commits from master
    commit 4e79baed423434b42d75f0d5c26757cd6792ce79
    commit b341d9cd027b0f7bec125d51b8298c3e31d7f685
    commit 02b85383a1f2a7c9677db2929b30fc283ad9a00c
    commit 8e3e32d4c7a10ddd8ee97576e030185e273bd2c0
    commit 8a1bade3296510df340d11f7c22353994cbdfa83
    commit ef6d7e225d8601489f8559483e1414dc62a62e8b
    commit 84a201f889f635c9405ea737d814fc43d274afd7

    Issue-ID: SO-3046
    Signed-off-by: Ramesh Parthasarathy(rp6768)<ramesh.parthasarathy@att.com>
    Change-Id: Ic7579f84746dad4002a5291edd54237eaaa602cf

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 9045a32..6cf18e5 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 9045a32ba68f9ffb2b07857701cff186d4b938d3
+Subproject commit 6cf18e59f1f7fc94bcae27785dc9a17008324fa8