Update git submodules

* Update docs/submodules/container4nfv from branch 'master'
  - update setup vagrant

    1. add copyright
    2. don't build box in default

    Change-Id: I2add34fda56a3d9553fbd5a902ab4e23ad1ab40c
    Signed-off-by: Guo Ruijing <ruijing.guo@intel.com>

diff --git a/docs/submodules/container4nfv b/docs/submodules/container4nfv
index d1c5fe6..613d576 160000 (submodule)
--- a/docs/submodules/container4nfv
+++ b/docs/submodules/container4nfv
@@ -1 +1 @@
-Subproject commit d1c5fe6321b7c8d7ae6c1c877ba9843b531b3e32
+Subproject commit 613d576521a1c1e524c3becda05a7ea5db4bc906