Make several private fields final in Client

These fields are all either initialized in their declarations or in the
constructor and then never reassigned.
Signed-off-by: Tony Germano <tony@germano.name>

Author: tonygermano

server/src/com/mirth/connect/client/core/Client.java

@@ -135,11 +135,11 @@ public class Client implements UserServletInterface, ConfigurationServletInterfa
 
 publicstaticfinalintMAX_QUERY_PARAM_COLLECTION_SIZE = 100;
 
-privateLoggerlogger = LogManager.getLogger(this.getClass());
-privateServerConnectionserverConnection;
-privatejavax.ws.rs.client.Clientclient;
-privateURIapi;
-privateAtomicBooleanclosed = newAtomicBoolean(false);
+privatefinalLoggerlogger = LogManager.getLogger(this.getClass());
+privatefinalServerConnectionserverConnection;
+privatefinaljavax.ws.rs.client.Clientclient;
+privatefinalURIapi;
+privatefinalAtomicBooleanclosed = newAtomicBoolean(false);
 privateInvocationHandlerRecorderrecorder;
 
 /**