renamed class to be consistent with python

Author: daniel-sanche

…main/java/com/example/app/JWTClient.java …ava/com/example/app/GoogleJwtClient.javaendpoints/getting-started/clients/src/main/java/com/example/app/JWTClient.java renamed to endpoints/getting-started/clients/src/main/java/com/example/app/GoogleJwtClient.java endpoints/getting-started/clients/src/main/java/com/example/app/JWTClient.java renamed to endpoints/getting-started/clients/src/main/java/com/example/app/GoogleJwtClient.java

@@ -38,7 +38,7 @@
 /**
  * JWTClient shows how a client can authenticate with a Cloud Endpoints service
  */
-public class JwtClient {
+public class GoogleJwtClient {
 
   // [START endpoints_generate_jwt_sa]
   /**