Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Horizon: service: Default to v2 API

    Horizon service definition hardcodes the API version to v3, and
    also overrides the value in our reclass model during interpolation.
    Adjust the default to '2'.

    While at it, move 'reclass' patching later in `salt.sh`, after
    the salt formula packages are installed.

    JIRA: FUEL-284

    Change-Id: I6f63b4d00ae85c82b076b3efef857e7cc4f3fd35
    Signed-off-by: Ting Wu <ting.wu@enea.com>
    Signed-off-by: Junaid Ali <junaidali.yahya@gmail.com>
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 90d0111..68ff467 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 90d0111f79d13a71af7952c289414474f3169abd
+Subproject commit 68ff467c4c2d9d0f201e2912c97616402f8109a3