Update git submodules

* Update docs/submodules/fuel from branch 'stable/fraser'
  - Merge "Define mongodb admin credentials" into stable/fraser
  - Define mongodb admin credentials

    They aren't used by mongodb formula anymore
    but still required by salt minion state.

    Change-Id: I3168e7934df38c34c5d6889f4332dc1be0415bd7
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index c8e44c3..9ea104f 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit c8e44c32328c4bb35dec6260faeb0ed7d815c160
+Subproject commit 9ea104f5af69d2df15ab615f1e2382a03a5f61c5