Update git submodules

* Update docs/submodules/pharos from branch 'master'
  - Merge "Adds Libvirt Handler"
  - Adds Libvirt Handler
    
    JIRA: N/A
    
    Adds a handler which can control the libvirt hypervisor
    on the remote host, in order to define the vm's and networks
    that are needed for an OPNFV deployment.
    Also adds the domain and network objects, which are simple abstractions
    of virtual machines and networks.
    
    Change-Id: Ia836e7b080b8bca220d5fdf6eb72b6c580cab4d1
    Signed-off-by: Parker Berberian <pberberian@iol.unh.edu>
    

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