LU-17629 utils: support hostname with

LU-17629 utils: support hostname with
 lustre_lnet_parse_nid_range()

For a hostname it's possible it maps to multiple IPs. In
this case lnetctl commands that attempt to use the hostname
can resolve to the wrong IP address. Update the function
lustre_lnet_parse_nid_range() to work with hostnames and
properly resolve the correct IP address. Update both
lnetctl ping and lnetctl discover to work with
lnet_parse_nid_range().

Test-Parameters: trivial testlist=sanity-lnet
Change-Id: I670799edcb04a02380e96c289ba26854b057d978
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54894
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>