ceph: add newline when using old monitors

The old tool would print a newline after outs, e.g. from 'ceph osd create'.
Do the same when we are talking to old monitors.  Also, put outs at the
top, not the bottom!

Tweak the json code to not add the newline again if we already did so
above.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Dan Mick <dan.mick@inktank.com>
ceph: pass --format=foo to old monitors

And --threshold too, although.. really.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviwed-by: Dan Mick <dan.mick@inktank.com>