LU-13005 lnet: remove LNetEQPoll

LU-13005 lnet: remove LNetEQPoll

There are no longer any users for LNetEQPoll, so remove it
and any mention of it.

Also remove the ln_eq_waitq which is no longer used.

Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: If0c1a2634e879c62925314a55b4c2ae0512d1837
Reviewed-on: https://review.whamcloud.com/36843
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-by: Amir Shehata <ashehata@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>