LU-12254 lnet: correct discovery LNetEQFree()

LU-12254 lnet: correct discovery LNetEQFree()

The EQ needs to be freed after all the queues are cleaned to avoid
having non-processed events on the event queue on free. This will
prevent the memory from being freed.

Lustre-change: https://review.whamcloud.com/34796
Lustre-commit: a0879b5985b41f92dede96e7f27623eb72102b15

Signed-off-by: Amir Shehata <ashehata@whamcloud.com>
Change-Id: Ie38ec25e09bf6d7cf2aadc30edd91d298897c51b
Reviewed-by: Olaf Weber <olaf.weber@hpe.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Chris Horn <hornc@cray.com>
Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/36036
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>