Adding user resource for v3

Author: Jochen Damzog

cloudfoundry-client-reactor/src/main/java/org/cloudfoundry/reactor/client/_ReactorCloudFoundryClient.java

@@ -73,6 +73,7 @@
 import org.cloudfoundry.client.v3.spaces.SpacesV3;
 import org.cloudfoundry.client.v3.stacks.StacksV3;
 import org.cloudfoundry.client.v3.tasks.Tasks;
+import org.cloudfoundry.client.v3.users.UsersV3;
 import org.cloudfoundry.reactor.ConnectionContext;
 import org.cloudfoundry.reactor.TokenProvider;
 import org.cloudfoundry.reactor.client.v2.applications.ReactorApplicationsV2;
@@ -131,6 +132,7 @@
 import org.cloudfoundry.reactor.client.v3.spaces.ReactorSpacesV3;
 import org.cloudfoundry.reactor.client.v3.stacks.ReactorStacksV3;
 import org.cloudfoundry.reactor.client.v3.tasks.ReactorTasks;
+import org.cloudfoundry.reactor.client.v3.users.ReactorUsersV3;
 import org.immutables.value.Value;
 import reactor.core.publisher.Mono;
 
@@ -491,6 +493,12 @@ public Users users() {
         return new ReactorUsers(getConnectionContext(), getRootV2(), getTokenProvider(), getRequestTags());
     }
 
+    @Override
+    @Value.Derived
+    public UsersV3 usersV3() {
+        return new ReactorUsersV3(getConnectionContext(), getRootV3(), getTokenProvider(), getRequestTags());
+    }
+
     /**
      * The connection context
      */

cloudfoundry-client/src/main/java/org/cloudfoundry/client/v3/users/User.java

@@ -29,12 +29,14 @@ public abstract class User extends Resource {
      * The username
      */
     @JsonProperty("username")
+    @Nullable
     public abstract String getUsername();
 
     /**
      * The presentation name
      */
     @JsonProperty("presentation_name")
+    @Nullable
     public abstract String getPresentationName();
 
     /**

integration-test/src/test/java/org/cloudfoundry/client/v3/UsersTest.java

@@ -37,10 +37,6 @@ public final class UsersTest extends AbstractIntegrationTest {
     @Autowired
     private CloudFoundryClient cloudFoundryClient;
 
-    public UsersTest(CloudFoundryClient cloudFoundryClient) {
-        this.cloudFoundryClient = cloudFoundryClient;
-    }
-
     private static Mono<CreateUserResponse> createUser(
             CloudFoundryClient cloudFoundryClient, String userId) {
         return cloudFoundryClient