Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Added unit tests for vping."
  - Added unit tests for vping.

    Also removed some instance variables and unnecessary methods.

    JIRA: FUNCTEST-813

    Change-Id: I13895674a9fd3de16c6a19410661440c5380c2f8
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 5093eef..5e7d3d9 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 5093eefb73d0f01d383fe55fdf7fdbd63f8888f2
+Subproject commit 5e7d3d9fcf2a5b7757ff8132b6f4c3b022e97abb