LU-554 add gnilnd awareness to LNet

LU-554 add gnilnd awareness to LNet

This allows servers on any network to talk to gnilnd routers.
This is 2.1 version of the Oracle 23884 attachment 31892.

Change-Id: I96777551b0caa50021ebb32755caaa01623ea97d
Signed-off-by: Wally Wang <wang@cray.com>
Reviewed-on: http://review.whamcloud.com/1285
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Lai Siyao <laisiyao@whamcloud.com>
Reviewed-by: Liang Zhen <liang@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>