rpc: use telescopic methods

Motivation:
helper methods needs different number of arguments. Telescopic methods make
code more readable and simpler to maintain.

Modification:
use telescopic methods for various RpcCall#call methods.

Result:
more readable code.

Acked-by: Albert Rossi
Target: master

oncrpc4j-core/src/main/java/org/dcache/oncrpc4j/rpc/RpcCall.java

@@ -403,23 +403,23 @@ public void call(int procedure, XdrAble args, CompletionHandler<RpcReply, RpcTra
      */
     public void call(int procedure, XdrAble args, CompletionHandler<RpcReply, RpcTransport> callback, long timeoutValue, TimeUnit timeoutUnits)
             throws IOException {
-        callInternal(procedure, args, callback, timeoutValue, timeoutUnits, null);
+        call(procedure, args, callback, timeoutValue, timeoutUnits, null);
     }
 
     /**
      * convenience version of {@link #call(int, XdrAble, CompletionHandler, long, TimeUnit, RpcAuth)} with no timeout
      */
     public void call(int procedure, XdrAble args, CompletionHandler<RpcReply, RpcTransport> callback, RpcAuth auth)
             throws IOException {
-        callInternal(procedure, args, callback, 0, null, auth);
+        call(procedure, args, callback, 0, null, auth);
     }
 
     /**
      * convenience version of {@link #call(int, XdrAble, CompletionHandler, long, TimeUnit, RpcAuth)} with no timeout or auth
      */
     public void call(int procedure, XdrAble args, CompletionHandler<RpcReply, RpcTransport> callback)
             throws IOException {
-        callInternal(procedure, args, callback, 0, null, null);
+        call(procedure, args, callback, 0, null, null);
     }
 
     /**