Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Add idf and pdf to the xci-create-virtual.yml

    This patch complements this other:

    https://gerrit.opnfv.org/gerrit/#/c/62575/2

    We require the pdf and the idf (when doing baremetal) in the create-vm
    role, so we should propagate that variable to the playbook that triggers
    those roles

    Change-Id: I15806d386db4e6b11192829f2dbc61662bffec2b
    Signed-off-by: Manuel Buil <mbuil@suse.com>