Update embedded-kafka to 2.4.0. (#4773)

Author: markusthoemmes

core/standalone/build.gradle

@@ -151,9 +151,7 @@ dependencies {
     compile project(':tools:admin')
     compile "org.rogach:scallop_${gradle.scala.depVersion}:3.3.2"
 
-    //Tried with 0.16.0 has support for Kafka 0.11.0 https://github.com/embeddedkafka/embedded-kafka/tree/v0.16.0
-    //But that causes class compatability issue die to use of newer client version
-    compile "io.github.embeddedkafka:embedded-kafka_${gradle.scala.depVersion}:2.1.1"
+    compile "io.github.embeddedkafka:embedded-kafka_${gradle.scala.depVersion}:2.4.0"
     compile "org.scala-lang:scala-reflect:${gradle.scala.version}"
 
     testCompile "junit:junit:4.11"