Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Apply neutron formula patch after formula update

    Change-Id: I8dba3676adc8cc49731d91db7cc028a9c5b1627d
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>
    (cherry picked from commit 952b5cc60febe14df428f92280448327572d5c24)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index c2b84a6..c60e591 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit c2b84a6b0b9df4a831ffa5f948afacd9fe1bb48a
+Subproject commit c60e5913d2c563c77d1e69a87f900e9fbf47eba7