Update git submodules

* Update docs/submodules/container4nfv from branch 'master'
  - disable multus

    Change-Id: I79854e52188833184ed60669b9f792afffcfd3c6
    Signed-off-by: Guo Ruijing <ruijing.guo@intel.com>

diff --git a/docs/submodules/container4nfv b/docs/submodules/container4nfv
index 37e8c63..70cc9a0 160000 (submodule)
--- a/docs/submodules/container4nfv
+++ b/docs/submodules/container4nfv
@@ -1 +1 @@
-Subproject commit 37e8c639239ca83e11c5f378b501adb9e673fcc3
+Subproject commit 70cc9a0e7088087acdefa7e30eabfc4c53422a20