Remove certificates and private keys from code

A file empty_file.txt has been added to allow stage3 to
build NBI docker image. It will be removed in subsequent
changes.

Change-Id: Ib82d30ecc6db88edc77a9c351d238141a249eaae
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
5 files changed