Update git submodules

* Update docs/submodules/container4nfv from branch 'master'
  - Modify the documentation about functest test.

    Modify the documentation for updating functest
    developing status.

    Change-Id: I5f31d8aa4af235b36f5f33a13658600dc32b2f01
    Signed-off-by: Jingzhao Ni <jingzhao.ni@arm.com>

diff --git a/docs/submodules/container4nfv b/docs/submodules/container4nfv
index 45445fe..5c35d57 160000 (submodule)
--- a/docs/submodules/container4nfv
+++ b/docs/submodules/container4nfv
@@ -1 +1 @@
-Subproject commit 45445fed30e2641ef53b7cfb2fd6b3b1ca3524d0
+Subproject commit 5c35d571efd2aed01e0ab32ad7e7c20c84cdb99e