LU-10467 ptlrpc: convert final users of LWI_TIMEOUT_INTERVAL

LU-10467 ptlrpc: convert final users of LWI_TIMEOUT_INTERVAL

LWI_TIMEOUT_INTERVAL causes l_wait_event to perform a slow
poll loop.  This is only needed if the event can happen without
triggering a wakeup on the wait-queue.

On this case, the event is a counter reaching zero, and we can
easily ensure a wakeup is sent whenever that counter becomes
zero.
So let's add those wake_ups, and change this to a simple
wait_event_idle_timeout().

At the same time, change all wake_up_all() calls on this wait queue to
simple wake_up().  wake_up_all() is only needed where there are
exclusive waiters, and this queue has no exclusive waiters.

Change-Id: I2bea069150f21b725025bacc7a4fa0cf4d95ab20
Signed-off-by: Mr NeilBrown <neilb@suse.de>
Reviewed-on: https://review.whamcloud.com/35979
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>