Implemented functionality for SDN in RO regarding controllers and port mapping...

Implemented functionality for SDN in RO regarding controllers and port mapping management. Also implemented the creation/deletion of dataplane networks using ovim. To be implemented creation/deletion of dataplane ports using ovim

Change-Id: Iff71058bdd51b61f7391a7144636a08c56249498
Signed-off-by: Pablo Montes Moreno <pablo.montesmoreno@telefonica.com>