staging: lustre: Use lnet_is_route_alive for router aliveness

lctl show_route and lctl route_list will output router aliveness
information via lnet_get_route(). lnet_get_route() should use the
lnet_is_route_alive() function, introduced in e8a1124
http://review.whamcloud.com/7857, to determine route aliveness.
Signed-off-by: Chris Horn <hornc@cray.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5733
Reviewed-on: http://review.whamcloud.com/14055Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Amir Shehata <amir.shehata@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lnet/lnet/router.c

@@ -607,8 +607,7 @@ lnet_get_route(int idx, __u32 *net, __u32 *hops,
 					*hops     = route->lr_hops;
 					*priority = route->lr_priority;
 					*gateway  = route->lr_gateway->lp_nid;
-					*alive = route->lr_gateway->lp_alive &&
-						 !route->lr_downis;
+					*alive = lnet_is_route_alive(route);
 					lnet_net_unlock(cpt);
 					return 0;
 				}