fix resend requests for ldlm imports.

Branch b1_6
b=17695
i=umka
i=tappro

  r=shadow
  - take into account the limit on the host because the higher limit the longer it takes to kill some locks.

i=Adilger
i=Tappro
test_70b fix: use do_nodes instead of loop to run rundbench

i=Adilger
skip liblustre for different client/mds versions

fix an error in the test_18b of sanity-quota.sh
b=17832
i=tianzy

i=Adilger
i=Johann
test_6 fix

b=12596
i=grev
i=adilger

check striping after setstripe in recovery-small test 18*.
move get_stripe_info() to t-f.

b=17371
i=Elena
fail each time cleanup/setup went wrong

i=Brian
load_modules fn modprobe.d fix

i=Huang Hua
check_config fn default network type fix

fix "should take longer" problem of test_18 of sanity-quota.sh
b=17773
i=johann
i=panda

i=Tappro
FAIL_ON_ERROR=false fix: force suits exit 1 if some tests failed

r=panda,shadow

- fixes possible sync long bulk unlink in ptlrpcd which would lead to assertion in forced umount time. Basically the fix is identical to 17310 where we move req to special phase UNREGISTERING and go processing other rpcs until bulk unlink is done;

- in sync bulk and reply unlink we check for wakeup condition every 1 sec to act quckly if unlink come instead of doing it every 20 sec as before.

r=shadow

- fixes in replay-single.sh test_59b

r=grev

- fixes and cleanups in test_124a from sanity.sh

i=Yury.Umanets
check_mem_leak fn fix: use echo instead of log fn

b=16129
i=adilger
i=green

- a high priority request list is added into service;
- once a lock is canceled, all the IO requests, including coming
ones, under this lock, are moved into this list;
- PING is also added into this list;
- once a lock cancel timeout occurs, the timeout is prolonged
if there is an IO rpc under this lock;
- another request list is added into the export, used to speed up
the rpc-lock matching.

b=17371
i=Johann Lombardi

testcase for 17371

i=Yury.Umanets
run acc-sm:formatall() only if forced

i=Adilger
force replay-dual to check and mount MOUNT2

i=Adilger
test_21c fix: restore config

Branch b1_6
b=16492
i=umka
i=tappro

i=Oleg.Drokin
RACER acc-sm test suit

i=Adilger
skip sanity test_100 for NETTYPE != tcp

r=shadow,adilger

Lift 4G limit on stripe_size*stripe_count
4G limit on stripe_size remains in place, though.

i=Yury.Umanets
insanity cleanup (remove dup fn, sync with HEAD t-f)

i=Oleg.Drokin
new runracer script

i=Adilger
use current config instead of reformat fs to have a single ost

i=Adilger
conf-sanity test_32* fix to not be skipped for remote setup

i=Adilger
replace cleanup_and_setup_lustre fn by check_and_setup_lustre fn

i=Adilger
check config if lustre is mounted before acc-sm run

i=Brian
assert_DIR cleanup

b=16578
o=adilger

A faster way to get long string.

r=johann,shadow

- fixes ptlrpcd blocking on very long reply unlink waiting. To do so new rpc phase introduced
RQ_PHASE_UNREGISTERING in which request stay until we have reply_in_callback() called by lnet
signaling that reply is unlinked. All requests in this state are skipped in processing by prlrcd
instead of waiting n * 300s on each of them. This allows ptlrpcd to process other rpcs in the set;

- make sure that inflight count is coherent with being present on sending or delay list. That is,
if we see inflight != 0, rpc must be on one of these lists. This is very helpful in
ptlrpc_invalidate_import() to show all rpcs still waiting after invalidating import;

- in ptlrpc_invalidate_import() wait maximal rq_deadline - now from all inflight rpcs instead of
obd_timeout which may be much longer. If calculated timeout is 0, obd_timeout is used. This fixes
the issue that rq_deadline - now > obd_timeout (very easy to see in logs) which led to inflight !=
0 assert because inflight rpcs timed out later than our wait period is finished;

- in ptlrpc_invalidate_import() wait forever for rpcs in UNREGISTERING phase. Check in assert for
inflight == 0 for wait timed out case if no rpcs in UNREGISTERING phase. Only those in
UNREGISTERING phase are allowed to stay longer than obd_timeout;

- added ptlrpc_move_rqphase() function. All phase changes go through it. Add debug_req() there to
track down all phase changes;

- conf_sanity.sh test_45 added to emulate very long reply unlink and also situation when
rq_deadline - now > obd_timeout;

- do not wait forever in ptlrpc_unregister_reply() for async case (using it from sets). sync case
left unchanged;

- make sure that ptlrpc_set_next_timeout() yields 1s timeout (instead of 0s) for the set with rpcs
in "unregistering" stage to prevent ptlrpcd from sleeping forever and hanging in test_45;

- in ptlrpcd() make sure that we do not sleep on 0 timeout.

i\Adilger
correct remote_[mds|ost] fn to work correctly on configuration
with several MDS/OSS nodes

b=15715
r=adilger,green

Fixed the race of destroying and enqueuing a ldlm lock at OST side.

b=16578
i=adilger

Description: ldlm_cancel_pack()) ASSERTION(max >= dlm->lock_count + count)
Details    : If there is no extra space in the request for early cancels,
             ldlm_req_handles_avail() returns 0 instead of a negative value.

  b:12512
  i:grev, adilger