Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [baremetal] Add required user on vcp nodes

    * add user of "ubuntu" so that functest gets cluster credentials
    * reduce cpu resources for vcp nodes in nofeature scenario
    * tune salt targets for maas state
    * specify ntp servers

    Change-Id: I433a1de1cd2c69c6747c62c3359f5485dee3bfa4
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index f2ea17e..08bb570 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit f2ea17e489b4c3f5e0b5cdc75860b094f3a05b90
+Subproject commit 08bb570b39b123c5a5adf70e34e05bb43a6e3387