[web session] fix '#1375582: sometime have to relogin since secure session cookie are used' by having different session cookie for http/https version. Also add application name to avoid potential pb when developping differents appls on the same port.

from os.path import join
from cubicweb.toolsutils import create_dir

option_renamed('pyro-application-id', 'pyro-instance-id')

create_dir(join(config.appdatahome, 'backup'))