LU-12410 lnet: Delete unused nid parsing code

LU-12410 lnet: Delete unused nid parsing code

Delete the nid parsing code from liblnetconfig that is no longer used.

Test-Parameters: trivial
Test-Parameters: testlist=sanity-lnet
Signed-off-by: Chris Horn <hornc@cray.com>
Change-Id: I6fbb3450756c7976836c3b6731d3ecd9f93cbf8d
Reviewed-on: https://review.whamcloud.com/35310
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Shaun Tancheff <stancheff@cray.com>
Reviewed-by: Petros Koutoupis <pkoutoupis@cray.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>