Fix lots of linter errors

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Correct help text

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Tweak usage

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
s/JOB/PATTERN/

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Add --description flag

Default to not printing job descriptions. Add -d/--description flag to
control that behavior. Change --delete's short option to -D. Other small
output tweaks.

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Exit gracefully on KeyboardInterrupt

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>