Update git submodules

Update git submodules

* Update docs/submodules/pharos from branch 'master'
  - [PDF] Preparations for vPDF support

    - extend check-{jinja2,schema}.sh to scan vPDFs and construct
      proper IDF path for vPDFs;
    - add support for '/' in PDF fields, by default filtered by j2
      template rendering;

    SPEC changes:
    - extend remote_management 'type' enum with 'libvirt';

    SCHEMA changes:
    - add new enum value 'libvirt' according to SPEC update;
    - add separate handling of 'remote_management' for baremetal/virtual;
    - remote_management 'versions' and 'mac_address' are mandatory for
      all but 'libvirt' (used to be mandatory for all);

    Change-Id: Ib3f711cae807c3ab27920391402ba74844f155c3
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>