ceph-fuse: install -dbg package, too

Signed-off-by: Sage Weil <sage@inktank.com>
install: be more forceful about package removal

In particular, I've hit this a few times:

iHR ceph-test-dbg                                0.57-417-gb531aa3-1precise                 (no description available

Signed-off-by: Sage Weil <sage@inktank.com>