Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Clean redundant error logs of refstack_defcore in the console"
  - Clean redundant error logs of refstack_defcore in the console

    1. Remove the file "refstack-error.log", and all the stderr and stdout
    will be stored in refstack.log
    2. Clean redundant error logs in the console and all the detailed error
    logs will be found in refstack.log.

    Change-Id: I7e71567c98dc89c529421eccbf1b497962b07405
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 84a87e7..70cfbfd 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 84a87e788b47d5a8fa3565195672fdddd35f4cf0
+Subproject commit 70cfbfdf6a040b9cd7d383ed863d12f90a77d389