Fixes two broken tests; now that the username and password aren't simple

(and immutable) strings, a .clone() operation needs to specifically
return a clone of the CredentialsProvider that can be modified with
setUsername/setPassword without affecting the original instance.

Author: Nick Johnson

src/main/java/com/rabbitmq/client/ConnectionFactory.java

@@ -1080,7 +1080,9 @@ protected AddressResolver createAddressResolver(List<Address> addresses) {
 
     @Override public ConnectionFactory clone(){
         try {
-            return (ConnectionFactory)super.clone();
+            ConnectionFactory clone = (ConnectionFactory)super.clone();
+            clone.credentialsProv = (CredentialsProvider)clone.credentialsProv.clone();
+            return clone;
         } catch (CloneNotSupportedException e) {
             throw new Error(e);
         }

src/main/java/com/rabbitmq/client/impl/AbstractCredentialsProvider.java

@@ -35,5 +35,14 @@ public void setUsername(String username) {
     public void setPassword(String password) {
         throw new UnsupportedOperationException();
     }
+    
+    /**
+     * Default clone() behavior is to call Object's clone() method. If you need more custom
+     * behavior, override clone().
+     */
+    @Override
+    public Object clone() throws CloneNotSupportedException {
+        return super.clone();
+    }
 
 }

src/main/java/com/rabbitmq/client/impl/CredentialsProvider.java

@@ -4,8 +4,10 @@
  * Provider interface for establishing credentials for connecting to the broker. Especially useful
  * for situations where credentials might change before a recovery takes place or where it is 
  * convenient to plug in an outside custom implementation.
+ * 
+ * @see com.rabbitmq.client.impl.AbstractCredentialsProvider
  */
-public interface CredentialsProvider {
+public interface CredentialsProvider extends Cloneable {
 
     String getUsername();
 
@@ -15,4 +17,6 @@ public interface CredentialsProvider {
 
     void setPassword(String password);
 
+    Object clone() throws CloneNotSupportedException;
+    
 }

src/main/java/com/rabbitmq/client/impl/DefaultCredentialsProvider.java

@@ -28,5 +28,5 @@ public void setUsername(String username) {
     public void setPassword(String password) {
         this.password = password;
     }
-
+    
 }