[example] change dropwizard names and package

dd-trace-examples/dropwizard-mongo-client/src/main/java/com/datadoghq/example/dropwizard/BookApplication.java

@@ -1,14 +1,14 @@
-package com.example.helloworld;
+package com.datadoghq.example.dropwizard;
 
-import com.example.helloworld.resources.SimpleCrudResource;
+import com.datadoghq.example.dropwizard.resources.SimpleCrudResource;
 import io.dropwizard.Application;
 import io.dropwizard.Configuration;
 import io.dropwizard.setup.Bootstrap;
 import io.dropwizard.setup.Environment;
 
-public class HelloWorldApplication extends Application<Configuration> {
+public class BookApplication extends Application<Configuration> {
   public static void main(String[] args) throws Exception {
-    new HelloWorldApplication().run(args);
+    new BookApplication().run(args);
   }
 
   @Override

dd-trace-examples/dropwizard-mongo-client/src/main/java/com/datadoghq/example/dropwizard/api/Book.java

@@ -1,4 +1,4 @@
-package com.example.helloworld.api;
+package com.datadoghq.example.dropwizard.api;
 
 import com.fasterxml.jackson.annotation.JsonProperty;
 import org.bson.Document;

dd-trace-examples/dropwizard-mongo-client/src/main/java/com/datadoghq/example/dropwizard/client/TracedClient.java

@@ -1,4 +1,4 @@
-package com.example.helloworld.client;
+package com.datadoghq.example.dropwizard.client;
 
 import com.datadoghq.trace.Trace;
 import io.opentracing.tag.StringTag;

dd-trace-examples/dropwizard-mongo-client/src/main/java/com/datadoghq/example/dropwizard/resources/SimpleCrudResource.java

@@ -1,7 +1,7 @@
-package com.example.helloworld.resources;
+package com.datadoghq.example.dropwizard.resources;
 
 import com.datadoghq.trace.Trace;
-import com.example.helloworld.api.Book;
+import com.datadoghq.example.dropwizard.api.Book;
 import com.google.common.base.Optional;
 import com.mongodb.MongoClient;
 import com.mongodb.client.MongoCursor;

dd-trace-examples/dropwizard-mongo-client/src/main/resources/dd-trace.yaml

@@ -23,7 +23,7 @@ sampler:
   # skipTagsPatterns: {"http.url": ".*/demo/add.*"}
   
 # Enable custom annotation tracing over a selected set of packages
-enableCustomAnnotationTracingOver: ["com.example"]
+enableCustomAnnotationTracingOver: ["com.datadoghq.example"]
 
 # Disable some instrumentations
 # disabledInstrumentations: ["apache http", "mongo", "jetty", "tomcat", ...]