Pre-gp_seq torture-test changes for v4.19

Hello!

The following changes to torture-testing come before the infamous ->gp_seq conversion:

1. Use a single build directory for torture scenarios (currently
there is one directory for each build within a given batch, which makes no sense given that all of these builds are serialized).

2. Remove obsolete TREE08-T.boot file. Use of the shiny new
"--bootargs rcutree.rcu_fanout_exact=1" makes use of a separate file unnecesary.

3. Make kvm-find-errors.sh find close calls as well as the usual
hard errors.

4. Make online/offline messages appear only for verbose=2. This
change is necessitated by the ability to make CPU-hotplug operations happen much more frequently than in the past.

5. Keep old-school dmesg format while Joe Perches is changing the
default format. Later, rcutorture can move to the new format and at the same time update the analysis scripts. (As opposed to having the analysis scripts just suddenly break when Joe's changes hit mainline.)

Thanx, Paul

------------------------------------------------------------------------

 b/include/linux/torture.h                                    |    2 
 b/kernel/locking/locktorture.c                               |    5 +-
 b/kernel/rcu/rcuperf.c                                       |    5 +-
 b/kernel/rcu/rcutorture.c                                    |    5 +-
 b/kernel/torture.c                                           |   15 +++---
 b/tools/testing/selftests/rcutorture/bin/configinit.sh       |   26 +++++------
 b/tools/testing/selftests/rcutorture/bin/kvm-build.sh        |   11 ++--
 b/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcu.sh  |    1 
 b/tools/testing/selftests/rcutorture/bin/kvm-recheck.sh      |    1 
 b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh   |    5 +-
 b/tools/testing/selftests/rcutorture/bin/kvm.sh              |    2 
 b/tools/testing/selftests/rcutorture/bin/parse-console.sh    |    7 ++
 tools/testing/selftests/rcutorture/configs/rcu/TREE08-T.boot |    1 
 13 files changed, 53 insertions(+), 33 deletions(-)