Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Remove all useless dependencies"
  - Remove all useless dependencies

    pexpect has been useless since onos testcases were removed [1]

    [1] https://gerrit.opnfv.org/gerrit/#/c/40229/

    Change-Id: I9de88ee56e44518568d6562d9cf639b9bf7be562
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index c4a413e..8e6430d 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit c4a413e8d4ae0516f31697e966478b78ce7dc0ff
+Subproject commit 8e6430da874e14dd56357d0280ffe7497c7cf40e