LU-10003 lnet: use Netlink to support LNet ping commands

LU-10003 lnet: use Netlink to support LNet ping commands

Completely replace the old pre-MR ping command ioctl using
Netlink which will also handle large NIDs. We do update
IOC_LIBCFS_PING_PEER, which only supports only small NIDs,
so older tools will keep working.

Test-Parameters: trivial testlist=sanity-lnet
Test-Parameters: serverversion=2.12 serverdistro=el7.9 testlist=runtests
Test-Parameters: clientversion=2.12 testlist=runtests
Change-Id: Ic82a18dc38e4bd4e78bf61da766f7a847da509a8
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/49360
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Cyril Bordage <cbordage@whamcloud.com>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>