Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Select the subset of snaps test cases

    Conflicts:
        functest/opnfv_tests/openstack/snaps/snaps_suite_builder.py

    Change-Id: I03e422d5dae0ced9cd7a5477c31359ffc7795c42
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 28c4803..34bdcde 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 28c4803587c071d9faef1abd0b444541d4b34b74
+Subproject commit 34bdcde999cefee25d71a55b8779c80f817fb58e