Update git submodules

* Update docs/submodules/container4nfv from branch 'master'
  - Merge "build vagrant/libvirt box"
  - build vagrant/libvirt box

    1. build box based on chef/bento
    2. move setup_vagrant to src/vagrant

    Change-Id: I69dffac9e16435b20975a4c73a2ac37543a8edf5
    Signed-off-by: Guo Ruijing <ruijing.guo@intel.com>

diff --git a/docs/submodules/container4nfv b/docs/submodules/container4nfv
index 85999db..6371740 160000 (submodule)
--- a/docs/submodules/container4nfv
+++ b/docs/submodules/container4nfv
@@ -1 +1 @@
-Subproject commit 85999db47c5f2292968c91184021bd220c7cd246
+Subproject commit 63717400ae46c430b62c0f73c8ee7c5afa415213