LU-7734 gnilnd: update GNI lnd driver to handle multirail api changes

LU-7734 gnilnd: update GNI lnd driver to handle multirail api changes

The multirail changes moved several parameters in struct lnet_ni
to the new data structure called struct lnet_net. This patch
updates the Gemini driver to handle the API changes.

Test-Parameters: trivial
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Change-Id: I75830c570ed56c5b1b665115e8ac96a733a7e57e
Reviewed-on: https://review.whamcloud.com/21192
Reviewed-by: Amir Shehata <amir.shehata@intel.com>
Tested-by: Amir Shehata <amir.shehata@intel.com>