Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Clean out merged upstream patch

    Change-Id: I0c8f87bad0fbe55684bd43547674ed91a31f39f8
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 4ee7da0..5ab2540 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 4ee7da0aa1128569bc97e5a28ce10a3ce1aac142
+Subproject commit 5ab2540591ad029b5b6cf23eab88959fbd14712b