Update git submodules

Update git submodules

* Update docs/submodules/pharos from branch 'master'
  - Merge changes from topics 'pdf-spec-update', 'pdf-schema'

    * changes:
      [PDF] [SPEC] disk_interface: Add 'scsi', 'iscsi'
      [PDF] [SPEC] Align interface keys for NIC names
      [PDF] [SPEC] Extend disk_rotation enum with '0'
      [PDF] Add schema validation

  - [PDF] [SPEC] disk_interface: Add 'scsi', 'iscsi'

    zte-pod3 and ericsson-pod1 define their disk interfaces as (i)SCSI.

    Change-Id: I97945f7a41eec4e8a38de544af95ce4af82df200
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
  - [PDF] [SPEC] Align interface keys for NIC names

    Jumpserver and cluster nodes use different keys for defining the NIC
    name ('nic' vs 'name'), switch all of them to 'name' for uniformity.

    Change-Id: I2d7720f5e5349ef59cf76a0e07749cfbd0d34d0b
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
  - [PDF] [SPEC] Extend disk_rotation enum with '0'

    ssd and nvme drives are static, so extend the list of accepted
    disk_rotation values to accomodate this.
    Use '0' so the enum can still be parsed as a numeric value.

    Change-Id: Ib8ef8cceb495c7eb588c68d151690747463167f5
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
  - [PDF] Add schema validation

    - create new YAML schema for PDF validation;
    - add basic python script for checking a PDF against the schema;
    - add bash wrapper for checking all PDFs in Pharos, to be leveraged
      later via a new verify CI job;

    Change-Id: I47e02642756b7a231138dec3d5258b100b4db72b
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>