Add ifmap-server package (with OpenContrail configs)

Info: Mirror for http://trust.f4.hs-hannover.de/download/iron/archive/
http://apt.sebian.fr/iron/
[confs] Added basic OC users (dns/ctrl missing)

https://github.com/Juniper/contrail-installer/blob/master/setup_contrail.py#L642-L646

https://github.com/Juniper/contrail-installer/blob/master/setup_contrail.py#L647-L658
are missing.