Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "Initialize mongodb cluster"
  - Initialize mongodb cluster

    * wait for mongodb service ready state
    * run rs.initiate() to start a replication set

    Change-Id: Ia9d2357d2ce0e9ba92a6be3d8b6c068efaa10822
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index a0f04d8..cde147c 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit a0f04d89d4114d11e62801190ddace50e2344ca5
+Subproject commit cde147cf3aec7f79b0a4d2bd60d01c355e5861ec