Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "[Baremetal] Add baremetal support to create-nodes"
  - [Baremetal] Add baremetal support to create-nodes
    
    Information about baremetal servers is collected for ironic to do
    the provisioning. Two main things are done:
    
    1 - baremetalhoststojson.yml fills the json config file fed to ironic
    so that it knows how to boot the blades. In the baremetal case, the
    create_vm.yml playbook will only create opnfv vm. The variable
    vms_to_create holds that information. The variable baremetal_nodes
    specifies the physical nodes (empty when non baremetal deployments)
    
    2 - For PXE to work, we create a file called baremetalstaticips that
    has the mapping between mac address from servers and its ip. That file
    is moved into the dnsmasq config directory
    
    Change-Id: I0e788db1deb50769c183b71524a68ac0b925f8aa
    Signed-off-by: Manuel Buil <mbuil@suse.com>
    

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