Update git submodules

* Update docs/submodules/promise from branch 'master'
  - Move promise package to root directory

    It seems mandatory as Functest must install promise in editable mode.
    Then npm install can be called in the source directory.
    It completes "Add promise package" [1]

    It would have worked well in classical mode.

    [1] https://gerrit.opnfv.org/gerrit/#/c/38639/

    Change-Id: Ia9ae55b127d0d324d97974f5e9b1923d7636d7cd
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/promise b/docs/submodules/promise
index 9e0a37d..7c94bb3 160000 (submodule)
--- a/docs/submodules/promise
+++ b/docs/submodules/promise
@@ -1 +1 @@
-Subproject commit 9e0a37dcdf99b52740cdf481c49136ce60e1bd9e
+Subproject commit 7c94bb3d81a1caabe54afef0387d7055e4e08f45