Rail optimization for rings (#1140)

- Modifies the ring creation algorithm to be friendlier to rail-optimized topologies (should not affect classic fabric topologies)

tools/scripts/topo_val.sh

@@ -21,7 +21,7 @@
 
 DIR="$(cd -P "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
-for i in {0..81}
+for i in {0..82}
 do
 	if [[ $i -eq 50 ]] || [[ $i -eq 51 ]]
 	then