Updated VNF member identifier

This change updates all the references to VNF member identifiers
that were previously used in the packages. Instead of 1 and 2, they
have now a meaningful name, and the tests need to be updated because
of that.

Change-Id: I7cff4cc0f9b16c1c85aa91b49294c3977e2bebda
Signed-off-by: aguilard <e.dah.tid@telefonica.com>
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>