Fixed the condition in StronglyConnectedComponents Issue: SPARK-3635

Author: oded <oded@HP-DV6.c4internal.c4-security.com>

Closes #2486 from odedz/master and squashes the following commits:

dd7890a [oded] Fixed the condition in StronglyConnectedComponents Issue: SPARK-3635

graphx/src/main/scala/org/apache/spark/graphx/lib/StronglyConnectedComponents.scala

@@ -75,7 +75,7 @@ object StronglyConnectedComponents {
         sccWorkGraph, Long.MaxValue, activeDirection = EdgeDirection.Out)(
         (vid, myScc, neighborScc) => (math.min(myScc._1, neighborScc), myScc._2),
         e => {
-          if (e.srcId < e.dstId) {
+          if (e.srcAttr._1 < e.dstAttr._1) {
             Iterator((e.dstId, e.srcAttr._1))
           } else {
             Iterator()