LU-10467 osp: use wait_event_idle_timeout()

LU-10467 osp: use wait_event_idle_timeout()

osp has 4 LWI_TIMEOUT() calls that pass an on_timeout
function.
In each case, the on_timeout function returns 1, so this
is equivalent to using wait_event_idle_timeout(), and
calling the function if the timeout happened.

One of the two functions passed does nothing except return 1, so it
can be ignored.
The other function, used only once, contains a CDEBUG message,
so we now call that when wait_event_idle_timeout() returns 0.

Change-Id: Ic153266e412d684c4aa6c7204ff5755d991d83c6
Signed-off-by: Mr NeilBrown <neilb@suse.de>
Reviewed-on: https://review.whamcloud.com/35988
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Petros Koutoupis <pkoutoupis@cray.com>
Reviewed-by: Shaun Tancheff <stancheff@cray.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>