Fix struct jobs_eta packing on 32 vs 64-bit archs

Signed-off-by: Jens Axboe <axboe@fb.com>
eta: only pass real size of jobs_eta

We might send this over the wire, so need sending more than we
actually used.

Signed-off-by: Jens Axboe <axboe@fb.com>
client: fix ETA run_str

We never touched it before, which meant the client would just
display an empty string. Make a valiant effort to allocate and
output the run_str.

Signed-off-by: Jens Axboe <axboe@fb.com>