Update git submodules

* Update docs/submodules/promise from branch 'stable/euphrates'
  - Merge "Fix defaultbranch in .gitreview" into stable/euphrates
  - Fix defaultbranch in .gitreview

    Change-Id: I775e015a6bf49f91ecb7ebaae08f392f4143879b
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/promise b/docs/submodules/promise
index 33c9f0e..2ff86a9 160000 (submodule)
--- a/docs/submodules/promise
+++ b/docs/submodules/promise
@@ -1 +1 @@
-Subproject commit 33c9f0efcc7c429eacbe28a8a49099b0d592d212
+Subproject commit 2ff86a92816faa4d71d2b0e260a5f44ce51d9b2c