Fix radosgw actually reloading after rotating logs.

The --signal argument to Debian's start-stop-daemon doesn't
make it send a signal, but defines which signal should be send
when --stop is specified.

Signed-off-by: Jan Harkes <jaharkes@cs.cmu.edu>
Use start-stop-daemon --chuid option to setuid to www-data.

Signed-off-by: Jan Harkes <jaharkes@cs.cmu.edu>
Merge pull request #100 from jaharkes/init

Fixes for RadosGW init script

Reviewed-by: Sage Weil <sage@inktank.com>