LU-11838 lnet: getname dropping addrlen argument

LU-11838 lnet: getname dropping addrlen argument

Since kernel 4.17 ->getname() does not take int *addrlen
argument anymore, instead it's returning the length to
the caller.

Linux-commit: 9b2c45d479d0fb8647c9e83359df69162b5fbe5f

Test-Parameters:trivial
Signed-off-by: Li Dongyang <dongyangli@ddn.com>
Change-Id: I4ad5de4a22f3fb23c07a356650ea7925acf07eed
Reviewed-on: https://review.whamcloud.com/34672
Tested-by: Jenkins
Reviewed-by: Gu Zheng <gzheng@ddn.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>