eta: show complete status line with max job states

eta: show complete status line with max job states

Make the ETA output buffer big enough to cope with the maximum possible
jobs when their states can't be compressed (i.e. when every job's state
is different to the state of the job that came before it).

Allows the following script to display the complete status line:

rw[0]='read'; rw[1]='write'; \
for i in {1..4096}; do \
  echo -e "[job$i]\nrw=${rw[$((i % 2))]}\n" \
          "runtime=15"; \
done | \
./fio --eta=always --group_reporting=1 --ioengine=null --size=1g \
 --time_based --bs=1k --thread --rate_iops=1 -

Fixes: https://github.com/axboe/fio/issues/500 ("Large number of threads
result in Seg faults")

Signed-off-by: Sitsofe Wheeler <sitsofe@yahoo.com>