LU-10003 lnet: migrate old route API to Netlink / YAML API

LU-10003 lnet: migrate old route API to Netlink / YAML API

With LNet route management now supported with the Netlink / YAML
API we can move the pre-MR route handling away from the
old ioctls. This allows use of large NIDs as well for IPv6
support.

Test-Parameters: trivial
Test-Parameters: testlist=conf-sanity env=ONLY="67"
Signed-off-by: James Simmons <jsimmons@infradead.org>
Change-Id: I1526d3e27967a10f556b8e31f15803659c0164bd
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/50440
Reviewed-by: Cyril Bordage <cbordage@whamcloud.com>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>