Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Improve the way of setting values in CONST"
  - Improve the way of setting values in CONST

    Use setattr instead of internal method (__setattr__).
    It must be completed by patches fixing [1] [2] and [3].

    [1] https://jira.opnfv.org/browse/FUNCTEST-930
    [2] https://jira.opnfv.org/browse/FUNCTEST-931
    [3] https://jira.opnfv.org/browse/FUNCTEST-932

    Change-Id: I9558f33f5ed4559b6031d75951d5637c0c0ef8cb
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index fb85975..5387e9a 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit fb85975fee7c3c67d3b10df58e4b742034fbd2ab
+Subproject commit 5387e9adab29aa72a0cbdea0615799eccaf6781d