init-radosgw*: fix status return value if radosgw isn't running

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
Merge pull request #571 from dalgaaf/fix-da-init-radosgw

init-radosgw*: fix status return value if radosgw isn't running

Backport: dumpling
Reviewed-by: Sage Weil <sage@inktank.com>