Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Add log info of refstack tests into functest.log"
  - Add log info of refstack tests into functest.log

    Change-Id: I9edf555ba17b491768fbe298e65c3b11b341d76e
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 4e39ca9..78be021 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 4e39ca947fcb30ab176bf3a2405a5b71965497f7
+Subproject commit 78be021d910088aeced1b62c9d00dffa33f74ca3