LU-13005 lnet: remove 'eq' from names, use 'handler'

LU-13005 lnet: remove 'eq' from names, use 'handler'

Now that we don't have an event-queue subsystem, using
'eq' in various names is confusing.
We have events and event handlers, so change
  lnet_eq_handler_t to lnet_handler_t
and change variable names mentioned 'eq' to just
mention 'handler'.

Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: If6f34ed41c565cb37ac798b5ba0411b6a471d6d0
Reviewed-on: https://review.whamcloud.com/37378
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>