Update git submodules

* Update docs/submodules/fuel from branch 'stable/fraser'
  - Update Salt version to 2017.7

    Salt 2016.x has a bug with states ordering coming from 'include'
    statement. Glance/Heat DB sync is applied before package setup
    although clearly specified 'require' in state.

    Change-Id: Icc2769f38567072ffa223f715443930f0c18dd1b
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 1ca8621..efec10f 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 1ca86212e3d22debdabc113e809ee2d9ea702259
+Subproject commit efec10f8e81336b101a931f0195493d863858302