Update git submodules

* Update docs/submodules/music/distributed-kv-store.git from branch 'master'
  to 4cf331ee856f52202900eca82618ce94434e9354
  - Migrate music-distributed-kv-store docs

    Merging this will create
    https://onap-music-distributed-kv-store.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: Ifd31e70d695f1d928eea47985e743eb7a578a5eb

diff --git a/docs/submodules/music/distributed-kv-store.git b/docs/submodules/music/distributed-kv-store.git
index 727a7d8..4cf331e 160000 (submodule)
--- a/docs/submodules/music/distributed-kv-store.git
+++ b/docs/submodules/music/distributed-kv-store.git
@@ -1 +1 @@
-Subproject commit 727a7d8e24082718c345d1d369486d8c285278e9
+Subproject commit 4cf331ee856f52202900eca82618ce94434e9354