Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - salt master, maas: Move mcpcontrol to 10.20.0.0/24

    Use INSTALLER_IP Jenkins param instead of SALT_MASTER_IP, allowing
    us to drop SALT_MASTER_IP completely from releng.

    mcpcontrol IP changes:
    - 192.168.10.100 becomes 10.20.0.2 (align with legacy Fuel master);
    - 192.168.10.3 becomes 10.20.0.3 (baremetal MaaS address);

    JIRA: FUEL-285

    Change-Id: I6e2d44c3a8b43846196bd64191735214167a76ce
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>