[ci] Add PDF/IDF config files for 2 virtual PODs

Add POD Descriptor File and Installer Descriptor File configuration for
the two IEC CI virtual PODs currently available in Jenkins [1, 2].

The configuration adheres to OPNFV standards [3, 4] and should be
compatible with all supported OPNFV installers (e.g. Compass4NFV, Fuel).

These configuration files will be leveraged by IEC CI jobs for daily
deployments / testing.

[1] https://jenkins.akraino.org/computer/prd-ubuntu1604-dev-48c-256g-1/
[2] https://jenkins.akraino.org/computer/prd-ubuntu1604-dev-48c-256g-2/
[3] https://opnfv-pharos.rtfd.org/en/latest/release/release-notes/lab-description/pdf.html
[4] https://opnfv-fuel.rtfd.io/en/latest/release/installation/\
    installation.instruction.html#opnfv-software-configuration-xdf

Change-Id: Ie57423cca65bf3f5c66ad9833f02d1a33d159734
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>