Update git submodules

* Update docs/submodules/optf/cmso.git from branch 'master'
  to 906b7987ef35115366a07af11e40ddad7462794e
  - Merge "Migrate optf-cmso docs"
  - Migrate optf-cmso docs

    Merging this will create
    https://onap-optf-cmso.readthedocs.io
    This build will run in parallel
    to the current docs generation method
    until we are ready to cut over.

    Issue-ID: CIMAN-364
    Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
    Change-Id: Ie5c421db11b77408fd901df5c283c116ec6af632

diff --git a/docs/submodules/optf/cmso.git b/docs/submodules/optf/cmso.git
index 673f9ae..906b798 160000 (submodule)
--- a/docs/submodules/optf/cmso.git
+++ b/docs/submodules/optf/cmso.git
@@ -1 +1 @@
-Subproject commit 673f9ae920aa038588c1e401d47cb885243a0f70
+Subproject commit 906b7987ef35115366a07af11e40ddad7462794e