Update git submodules

Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "[baremetal] cleanup: Parameterize VCP hostnames"
  - [baremetal] cleanup: Parameterize VCP hostnames

    We already define the hostnames in a central location
    (openstack_init), so use the reclass params instead of hardcodes.
    Also handle hardcoded hostnames in system.haproxy.proxy.listen
    and system.mongodb.server.cluster.

    This will also simplify later changes for novcp scenarios.

    JIRA: FUEL-310

    Change-Id: I2a8b4cd1fcb61a7c63f9047123d985bb688dca0a
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>