Update git submodules

* Update docs/submodules/promise from branch 'stable/euphrates'
  - Added support for Keystone v3

    JIRA: PROMISE-80

    Functest test script only

    Change-Id: Id5d75383586d4e79d106767b1aeb7dc5bc588724
    Signed-off-by: Bertrand Souville <souville@docomolab-euro.com>
    (cherry picked from commit cd8d36d83af6541dc5f313bee5758548366ff5ff)

diff --git a/docs/submodules/promise b/docs/submodules/promise
index c0f8f34..de36192 160000 (submodule)
--- a/docs/submodules/promise
+++ b/docs/submodules/promise
@@ -1 +1 @@
-Subproject commit c0f8f3487b1782eeb05ce6d0d2c4b8578594e5dd
+Subproject commit de3619244e2f050fc03de7c7fec2d17182f343cb