LU-9121 lnet: Select NI/peer NI with highest prio

LU-9121 lnet: Select NI/peer NI with highest prio

Modify the selection algorithm to select the highest priority
local and peer NI. Health always trumps all other selection
criteria

Test-Parameters: trivial testlist=lnet-selftest,sanity-lnet
Signed-off-by: Amir Shehata <ashehata@whamcloud.com>
Signed-off-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Change-Id: I487a706f4da30311d0bd59fe03f72dbe68a52425
Reviewed-on: https://review.whamcloud.com/34351
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Tested-by: jenkins <devops@whamcloud.com>