Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [salt master] Disable broken _orchestration.conf

    The new orchestration configuration file includes multiple
    fragments from all installed formulas; breaking due to an unguarded
    dependency include in keystone formula meta/salt.yml.

    Temporarily disable the new config generation until fixed upstream.

    Change-Id: I8476e5b60b531f08f779df2826b23cd42a043d9b
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index c51c387..8ac1c0f 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit c51c387f8c7d1c9ee03e35822c896432e4d646a0
+Subproject commit 8ac1c0fa491ab5de2eaf128374f9c73202df1751