Update git submodules

Update git submodules

* Update docs/submodules/daisy from branch 'master'
  - Merge "Use PDF(POD descriptor file) and correct the mapping of nodes and roles"
  - Use PDF(POD descriptor file) and correct the mapping of nodes and roles

    JIRA: DAISY-42
    JIRA: DAISY-56

    In bare metal deployment, we can use PDF to get MAC addresses of nodes
    https://gerrit.opnfv.org/gerrit/#/c/38387/.
    Then we can use the MACs to help to distinguish the discovered nodes
    and assign roles to them, like virtual deployment in the link
    https://gerrit.opnfv.org/gerrit/#/c/38381/.

    Change-Id: Ib0f1a60b8935f528a828f716ccc916b767cfa6f9
    Signed-off-by: Alex Yang <yangyang1@zte.com.cn>