Add gradle wrapper 4.9

Adding gradle wrapper for the version that
works well with current state of the project.

With older gradle versions it fails e.g. with zincClasspath not set.

Newer gradle versions require shade plugin 2.x.

Author: tlasica

BuildTestAll.sh

@@ -20,7 +20,7 @@ for language in "java" "scala"
 do
     echo "Testing $language Builds"
     echo "Gradle"
-    test_command "$language/gradle" "gradle -q shadowJar"
+    test_command "$language/gradle" "./gradlew -q shadowJar"
     echo "SBT"
     test_command "$language/sbt" "sbt -Dsbt.log.noformat=true --error assembly"
     echo "Maven"

java/gradle/dse/gradle/wrapper/gradle-wrapper.jar

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-bin.zip

java/gradle/dse/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-bin.zip