Fixed the fail2ban init file issue.

Fixed some issues with the DAEMON's path and the SOCKFILE's location.
debian branch is for the debian package -- it is not to be used for "manual" setup.py install.  During packaging fail2ban-client gets installed under system-wide /usr/bin .  It would be awkward demanding me now to patch debian/fail2ban.init to "adjust" DAEMON line.  May be what we should do is to move this file under files/debian-initd, then indeed maintain a patch to adjust the paths for the package.  I would be ok with that