Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Merge "Get the right git commit ids for ubuntu image" into stable/euphrates
  - Get the right git commit ids for ubuntu image

    Complement https://gerrit.opnfv.org/gerrit/#/c/45017

    Change-Id: If52dee7c16dcc8606e72ebc198bc36e713792418
    Signed-off-by: Linda Wang <wangwulin@huawei.com>
    (cherry picked from commit ae660ffa3285307edd41898cb2eaba22864d4f2d)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index edbc21a..7935672 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit edbc21af0b4879ccba376b07ae4909cf5bc12853
+Subproject commit 79356722e6a015e2486c1bd59c6729ebd37aaa87