Print progress of reaidng job info when killing.

Signed-off-by: Sandon Van Ness <sandon@inktank.com>
Speed up teuthology-kill.

Read less information when its not needed for killing runs.

Signed-off-by: Sandon Van Ness <sandon@inktank.com>
Add more info in comments.

Signed-off-by: Sandon Van Ness <sandon@inktank.com>
Merge pull request #314 from ceph/wip-8923

Speed up teuthology-kill.