fix(aws): fix more extraAttributes renaming spots that were missed (spinnaker#4401)

Author: cfieber

clouddriver-aws/src/main/groovy/com/netflix/spinnaker/clouddriver/aws/deploy/converters/RebootInstancesAtomicOperationConverter.groovy

@@ -47,7 +47,7 @@ class RebootInstancesAtomicOperationConverter extends AbstractAtomicOperationsCr
     try {
       def serverGroups = converted.instanceIds.findResults {
         def instance = amazonInstanceProvider.getInstance(converted.credentials.name, converted.region, it)
-        return instance?.extraAttributes()?.get("serverGroup")
+        return instance?.extraAttributes?.serverGroup
       } as Set<String>
       converted.serverGroups = serverGroups
     } catch (Exception e) {

clouddriver-aws/src/main/groovy/com/netflix/spinnaker/clouddriver/aws/provider/view/AmazonLoadBalancerProvider.groovy

@@ -200,7 +200,7 @@ class AmazonLoadBalancerProvider implements LoadBalancerProvider<AmazonLoadBalan
             ]
         )
       } : [],
-      detachedInstances: serverGroup.extraAttributes().detachedInstances,
+      detachedInstances: serverGroup.extraAttributes?.detachedInstances,
       cloudProvider: AmazonCloudProvider.ID
     )
   }