relocate jetty class on testing module

Author: amarziali

dd-java-agent/instrumentation/jetty-client-9.1/build.gradle

@@ -63,7 +63,7 @@ configurations{
 dependencies {
   compileOnly group: 'org.eclipse.jetty', name: 'jetty-client', version: '9.1.0.v20131115'
 
-  testImplementation(project(':dd-java-agent:testing')) {
+  testImplementation(project(path:':dd-java-agent:testing', configuration: 'shadow')) {
     // explicitly declared below.
     exclude module: 'jetty-server'
   }

dd-java-agent/testing/build.gradle

@@ -1,3 +1,7 @@
+plugins {
+  id 'com.github.johnrengelman.shadow'
+}
+
 ext {
   // need access to sun.misc package
   skipSettingCompilerRelease = true
@@ -75,6 +79,15 @@ dependencies {
   testCompileOnly deps.autoserviceAnnotation
 }
 
+shadowJar {
+  dependencies {
+    include(dependency {
+      it.moduleGroup == 'org.eclipse.jetty'
+    })
+  }
+  relocate "org.eclipse.jetty", "datadog.eclipse.jetty"
+}
+
 tasks.withType(Test).configureEach {
   // SpockRunner that we use to run agent tests cannot be properly ported to JUnit 5,
   // since the framework does not provide the hooks / extension points