Update git submodules

* Update docs/submodules/container4nfv from branch 'master'
  - Merge "update onap branch"
  - update onap branch

    Change-Id: Ifa16c7ece709dea5f2c2413a76ac3656fe23ced3
    Signed-off-by: Guo Ruijing <ruijing.guo@intel.com>

diff --git a/docs/submodules/container4nfv b/docs/submodules/container4nfv
index 910d9e6..687d4ba 160000 (submodule)
--- a/docs/submodules/container4nfv
+++ b/docs/submodules/container4nfv
@@ -1 +1 @@
-Subproject commit 910d9e6375d9e43336ff8f839c8ade0cb496b283
+Subproject commit 687d4ba8b99ef6d8d987ed42660c8b3080be7008