deploy: chown -R root:archipelago /etc/synnefo

Pithos and Cyclades components require ArchipSynnefo which makes
gunicorn run as root:archipelago.

Currently all snf-* packages install their conf files as
root:www-data. Note that the g+s mode in /etc/synnefo does is not
enough since debian uses mv and not copy to put the conf files in
the proper dir.

Thus we have to manually change the owner of conf files after
package installation.

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