init.d: write default pid file to /tmp/dabbad.pid.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
dabbad: unlink pidfile on SIG(TERM|INT|QUIT).

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
dabbad: remove unix socket on SIG(TERM|INT|QUIT).

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
dabbad: pack all config element to a structure.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>