bug 8927: enable civetweb testing for rgw
Added a facet to test both apache and civetweb as frontend for rgw

Signed-off-by: tamil <tamil.muthamizhan@inktank.com>
s/apache/apache2

Signed-off-by: tamil <tamil.muthamizhan@inktank.com>
Merge pull request #98 from ceph/rgw_civetweb

bug 8927: include frontend:civetweb for rgw tests