LU-16282 lnet: fix debug message in lnet_discovery_event_reply

LU-16282 lnet: fix debug message in lnet_discovery_event_reply

The message in lnet_discovery_event_reply currently says
"Peer X has discovery disabled" even though the same path
may be taken if discovery is disabled locally.
Change the debug message to indicate whether discovery is
disabled on the peer side or locally.

Test-Parameters: trivial testlist=sanity-lnet
Signed-off-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Change-Id: I9c8be2286693c2bfc3f8cf67b6f3b8ab26f8258b
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/48997
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: Frank Sehr <fsehr@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>