Name test container images as per docker hub naming convention (#275)

* Add ReceiveSendGreetingServlet and publish wf for matric project

* Add donation doc to readme and missing license header

* remove gson dependency and customer models

* undo changes in test till new docker images are published

* Make byte read wo need to buffer size

* remove /agent from image names

* test with single image publish

* update test image names as per docker hub registry convention

Author: samarth-gupta-traceable

smoke-tests/matrix/build.gradle

@@ -71,7 +71,7 @@ targets.each { server, data ->
           rename { _ -> "app.war" }
         }
       }
-      def image = "hypertrace/agent/java-test-containers:$server-$version-jdk$jdk-$extraTag"
+      def image = "hypertrace/java-agent-test-containers:$server-$version-jdk$jdk-$extraTag"
       matrix.add(image)
       def buildTask = tasks.register("${server}Image-$version-jdk$jdk", DockerBuildImage) {
         it.dependsOn(prepareTask)