update radosgw recipe

- Create /etc/ceph/ dir
- Create/Update ceph.conf with radosgw client
- Support upstart and init
- Create radosgw client keyring

Signed-off-by: Alexandre Marangone <alexandre.marangone@inktank.com>
Update radosgw_apache2 recipe

- Multi distro support (CentOS/ubuntu tested)
- apache2::mod_fastcgi only supports Debian/Ubuntu, change it to
an apache_module
- Restart apache once new configuration is applied
- Add fastcgi script template

Signed-off-by: Alexandre Marangone <alexandre.marangone@inktank.com>