Use common functionality in frigga for next asg name.

grails-app/controllers/com/netflix/asgard/ClusterController.groovy

@@ -394,6 +394,8 @@ ${lastGroup.loadBalancerNames}"""
             }
 
             final String nextGroupName = Relationships.buildNextAutoScalingGroupName(lastGroup.autoScalingGroupName)
+            if (params.nextAsgName && params.nextAsgName != nextGroupName)
+                throw new IllegalStateException("Asked for ${params.nextAsgName} but found ${nextGroupName}")
             List<ScalingPolicyData> lastScalingPolicies = awsAutoScalingService.getScalingPolicyDatas(userContext,
                     lastGroup.autoScalingGroupName)
             List<ScalingPolicyData> newScalingPolicies = lastScalingPolicies.collect { ScalingPolicyData policy ->

src/groovy/com/netflix/asgard/Relationships.groovy

@@ -182,11 +182,7 @@ class Relationships {
     }
 
     static String buildNextAutoScalingGroupName(String previousGroupNameInCluster) {
-        Names names = dissectCompoundName(previousGroupNameInCluster)
-        Integer previous = names.sequence
-        Integer next = (previous == null || previous >= CLUSTER_MAX_SEQUENCE_NUMBER) ? 0 : previous + 1
-        String threeDigitNextNumber = String.format("%03d", next)
-        "${names.cluster}-v${threeDigitNextNumber}"
+        return AutoScalingGroupNameBuilder.buildNextGroupName(previousGroupNameInCluster)
     }
 
     static String buildLoadBalancerName(String appName, String stack, String detail) {