Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Remove installer constraint on vyos_vrouter test case

    Change-Id: I44bdffc76fd2ee842c63b8fcddbe1696f23958a8
    Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 5b4ac60..a6e8043 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 5b4ac607d4c1865ca3cba1c20f5d11444b1ee616
+Subproject commit a6e80436362806e3fff79da2baa1c68bf1ecf647