ensure RegistryAuth email is set in tests

testAuth and testBadAuth is failing on Docker 1.9 and 1.10 because
RegistryAuth.email is not set when we send it to the daemon

src/main/java/com/spotify/docker/client/messages/RegistryAuth.java

@@ -41,9 +41,6 @@
 @JsonAutoDetect(fieldVisibility = ANY, getterVisibility = NONE, setterVisibility = NONE)
 public abstract class RegistryAuth {
 
-  private static final String DEFAULT_REGISTRY = "https://index.docker.io/v1/";
-  private static final String DUMMY_EMAIL = "[email protected]";
-
   @SuppressWarnings("FieldCanBeLocal")
   private static final ObjectMapper MAPPER =
       new ObjectMapperProvider().getContext(RegistryAuth.class);

src/test/java/com/spotify/docker/client/DefaultDockerClientTest.java

@@ -301,19 +301,22 @@ public class DefaultDockerClientTest {
   @Rule
   public final TestName testName = new TestName();
 
+  private final RegistryAuth registryAuth = RegistryAuth.builder()
+      .username(AUTH_USERNAME)
+      .password(AUTH_PASSWORD)
+      .email("[email protected]")
+      .build();
+
   private final String nameTag = toHexString(ThreadLocalRandom.current().nextLong());
 
   private URI dockerEndpoint;
 
   private DefaultDockerClient sut;
 
-  private RegistryAuth registryAuth;
-
   private String dockerApiVersion;
 
   @Before
   public void setup() throws Exception {
-    registryAuth = RegistryAuth.builder().username(AUTH_USERNAME).password(AUTH_PASSWORD).build();
     final DefaultDockerClient.Builder builder = DefaultDockerClient.fromEnv();
     // Make it easier to test no read timeout occurs by using a smaller value
     // Such test methods should end in 'NoTimeout'
@@ -678,6 +681,7 @@ public void testAuth() throws Exception {
   public void testBadAuth() throws Exception {
     final RegistryAuth badRegistryAuth = RegistryAuth.builder()
         .username(AUTH_USERNAME)
+        .email("[email protected]") // docker < 1.11 requires email to be set in RegistryAuth
         .password("foobar")
         .build();
     final int statusCode = sut.auth(badRegistryAuth);