LU-9121 lnet: select best peer and local net

LU-9121 lnet: select best peer and local net

Select the healthiest and highest priority peer and local net when
sending a message.

Test-Parameters: trivial testlist=lnet-selftest,sanity-lnet
Signed-off-by: Amir Shehata <ashehata@whamcloud.com>
Change-Id: I42717e7fdc3226c6faa7c59c713f18422e27f2e5
Reviewed-on: https://review.whamcloud.com/34352
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>