Update git submodules

* Update docs/submodules/container4nfv from branch 'master'
  - add cleanup for container4nfv

    1. move interface cleanup to cleanup.sh
    2. can destroy vms after jenkins abort

    Change-Id: I627070ace6fa5cded507964091c40784ce4a19f9
    Signed-off-by: Guo Ruijing <ruijing.guo@intel.com>

diff --git a/docs/submodules/container4nfv b/docs/submodules/container4nfv
index 8702867..5f41686 160000 (submodule)
--- a/docs/submodules/container4nfv
+++ b/docs/submodules/container4nfv
@@ -1 +1 @@
-Subproject commit 870286745312e2794712ee40c6afc9056929f803
+Subproject commit 5f41686bc6a09307e346bbbf980ab45df7ac9ced