Update git submodules

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

    JIRA: PROMISE-80

    Modified Promise shim-layer as well

    Change-Id: I82340a6af5c3e6056e77323ca5c44ecdf4e109b6
    Signed-off-by: Bertrand Souville <souville@docomolab-euro.com>
    (cherry picked from commit a8cd506d6759833231b1b8806082d793faf0997a)

diff --git a/docs/submodules/promise b/docs/submodules/promise
index de36192..5698eda 160000 (submodule)
--- a/docs/submodules/promise
+++ b/docs/submodules/promise
@@ -1 +1 @@
-Subproject commit de3619244e2f050fc03de7c7fec2d17182f343cb
+Subproject commit 5698eda65d99786a9668bd00e49b5a158be90c35