Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Remove check_success_rate"
  - Remove check_success_rate

    After the introduction of is_successful method
    in TestCase class, this is not needed anymore.

    Change-Id: I70f6f9e10495601cd5443467347b97efe27b81a3
    Signed-off-by: jose.lausuch <jose.lausuch@ericsson.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 54c02e2..6a655e8 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 54c02e2bd175a80a5659ddd4156c1166347efc93
+Subproject commit 6a655e830dd891d0b5afec601b4fb2461b1fad42