Synnefo

Make snf-webproject create '/var/log/synnefo' dir

Make snf-webproject package create the '/var/log/synnefo' directory and
change its owner and group to 'www-data'. This was until now done by
snf-cyclades-app package. However, since the gunicorn file that is...

Add dh_installdeb related files

snf-cyclades-app/gtools need this because they install daemons and
update-rc.d must be invoked.
snf-dispather runs as www-data so we need to fix /var/log/synnefo
permissions.

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>