Ceph: more radosgw changes, drop apache::mod

We don't do pluginsync and it's silly to call out to ruby types for a
simple symlink. It's ugly though, but it will do until we replace the
apache module altogether by something sensible.

Also remove the Apache <IfModule>s. If they're not loaded, something's
wrong and we shouldn't bring up Apache anyway.

Change-Id: Ie0772296e4b8346ab3f6155062168b43210f101c