rcutorture: Include grace-period sequence numbers in failure/close-call

This commit includes the grace-period sequence numbers at the beginning
and end of each segment in the "Failure/close-call rcutorture reader
segments" list.  These are in hexadecimal, and only the bottom byte.
Currently, only RCU is supported, with its three sequence numbers (normal,
expedited, and polled).

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
4 files changed