Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Update salt init scripts source

    Change-Id: I269e397b78d55794b1c49bf582cc0e663cbe9ca6
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 7a38c0d..476fd41 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 7a38c0d5f2b544bea0b5bcf755747f1fd04e5814
+Subproject commit 476fd41a6200ba17bfd30719b62ed5e07075c77d