Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - submodules: Disable remote tracking

    Stop following remote master HEAD refs for git submodules.
    This should fix recent deploy failures caused by upstream changes in
    salt-formulas-scripts repo.

    Change-Id: I32b422f2dd7d31d51c65f1cd0101111e9ed2fb5e
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 096d8e7..bb4d411 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 096d8e74b579677b934ff5da9c423da74549cc70
+Subproject commit bb4d411c652dd37b17ab69c85ae75d50fe815561