Enable killing runs that haven't even started yet

This requires passing --machine-type.

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
schedule_suite: be slightly more verbose

Signed-off-by: Sage Weil <sage@inktank.com>
Fix #7369: "sed expression must be raw string"

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