Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Changing project name of vRouter

    JIRA: FUNCTEST-769

     When pushing result to DB in vRouter module an error occurred.
     couse is wrong project name.
     We changed project name from "vRouter" to "functest".

    Change-Id: I8b8289b48330b17b6d6620524024dea4f488e38a
    Signed-off-by: Shuya Nakama <shuya.nakama@okinawaopenlabs.org>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 8d177dd..9439d68 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 8d177dd1ac61078cb4134a1ff925ce25a777f5a0
+Subproject commit 9439d684449825f8d580c26b1b9475ccbdde698a