Update git submodules

* Update docs/submodules/promise from branch 'master'
  - Merge "Proposal to move Promise shim-layer code to a new deprecated folder"
  - Proposal to move Promise shim-layer code to a new deprecated folder

    Promise test cases have been disabled in Functest

    Promise shim-layer has been marked as DEPRECATED in Euphrates

    Change-Id: I98ecd9ae2b25c102f478fc3869f23e6c70d32d8d
    Signed-off-by: Bertrand Souville <souville@docomolab-euro.com>

diff --git a/docs/submodules/promise b/docs/submodules/promise
index e081a20..a7a7034 160000 (submodule)
--- a/docs/submodules/promise
+++ b/docs/submodules/promise
@@ -1 +1 @@
-Subproject commit e081a200bc12b4c23d283b1d447dbaa4d73a1228
+Subproject commit a7a703420f552c0df396575e893a319cc0233ea8