LU-9667 lnet: Userspace control to show lnd peer stats

LU-9667 lnet: Userspace control to show lnd peer stats

This patch adds the functions to display lnd peer stats
using the following lnetctl command -

lnetctl peer stats --lnd

Test-Parameters: trivial
Change-Id: If89142decbd1784f29928a09f71514f933a0a573
Signed-off-by: Sonia Sharma <sharmaso@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/29353
Reviewed-by: Amir Shehata <ashehata@whamcloud.com>
Tested-by: Jenkins
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Tested-by: Maloo <maloo@whamcloud.com>