LU-15983 lnet: Define KFILND network type

Define the KFILND network type. This reserves the network type number
for future implementation and allows creation of kfi peers and
adding routes to kfi peers.

Test-Parameters: trivial testlist=sanity-lnet
HPE-bug-id: LUS-11060
Signed-off-by: Chris Horn <chris.horn@hpe.com>
Change-Id: I9111645f1290c8af4937d1b2689a068df81922a4
Reviewed-on: https://review.whamcloud.com/47830
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Cyril Bordage <cbordage@whamcloud.com>
Reviewed-by: Frank Sehr <fsehr@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>