Fix osm-common and n2vc dependencies to use v9.0

The dependencies in requirements.txt were pointing to master
instead of pointing to v9.0. With the recent changes in the
repos, osm-common and n2vc in master did not have dependencies,
so errors can appear.

The file setup.py was also updated because it was enough to specify
the requirements there as 'n2vc' and 'osm-common'.

Change-Id: I9140439a4b9e0e0cee2c04f148491445840c3863
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>