Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Add swagger support for Rest API

    JIRA: FUNCTEST-854

    Change-Id: Ic010604d3ba0cc46092cf2a1ae8bb41afa73c920
    Signed-off-by: Linda Wang <wangwulin@huawei.com>
    (cherry picked from commit b621b6b4b70299a60ad3e26ed6b04450f84b603e)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 124a658..7683b97 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 124a658f45154235af466d70cb8364ef4ab79a36
+Subproject commit 7683b977ee4b1c88b0876b4a18a1ae76aad6f8ab