Update git submodules

* Update docs/submodules/vvp/documentation.git from branch 'master'
  to 2872e33beeb77c8563bf587ed0164b0d412e178f
  - Migrate vvp-documentation docs

    Merging this will create
    https://onap-vvp-documentation.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: I4fa42aede569af1e528421e7cbae917a63adb9ba

diff --git a/docs/submodules/vvp/documentation.git b/docs/submodules/vvp/documentation.git
index 13a999c..2872e33 160000 (submodule)
--- a/docs/submodules/vvp/documentation.git
+++ b/docs/submodules/vvp/documentation.git
@@ -1 +1 @@
-Subproject commit 13a999c54df22efd212a153d72f74816c4227144
+Subproject commit 2872e33beeb77c8563bf587ed0164b0d412e178f