Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Delete some unittest which block the verify job

    The unittest of cloudify_vrouter cannot work now.

    Change-Id: I1b6c591458aefe9aec628a02239f5c611ec3676c
    Signed-off-by: Alex Yang <yangyang1@zte.com.cn>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index ac2de43..bbe21a3 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit ac2de4356604f81cff9c303f0af36601e8a330ea
+Subproject commit bbe21a39bb86d1c548728ba3aaf98bb2a9419ec3