core: remove CompletionHandler

this interface was stolen from Java7. As java7 is required for
current release we can simply use original from JDK.

Target: trunk
Require-book: no
Require-notes: no
Acked-by: Paul Millar
Patch: http://rb.dcache.org/r/5084/

Author: kofemann

modules/dcache/src/main/java/org/dcache/chimera/nfsv41/mover/NfsExcecutionService.java

@@ -7,12 +7,12 @@
 import java.io.IOException;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
+import java.nio.channels.CompletionHandler;
 import java.util.List;
 import org.dcache.cells.CellMessageSender;
 import org.dcache.chimera.ChimeraFsException;
 import org.dcache.chimera.nfs.v4.xdr.stateid4;
 import org.dcache.pool.classic.Cancelable;
-import org.dcache.pool.classic.CompletionHandler;
 import org.dcache.pool.classic.MoverExecutorService;
 import org.dcache.pool.classic.PoolIORequest;
 import org.dcache.pool.classic.PoolIOTransfer;

modules/dcache/src/main/java/org/dcache/pool/classic/CompletionHandler.java

@@ -6,6 +6,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import dmg.cells.nucleus.CDC;
+import java.nio.channels.CompletionHandler;
 
 /**
  *

modules/dcache/src/main/java/org/dcache/pool/classic/LegacyMoverExecutorService.java

@@ -1,5 +1,7 @@
 package org.dcache.pool.classic;
 
+import java.nio.channels.CompletionHandler;
+
 /**
  *
  * @since 1.9.11

modules/dcache/src/main/java/org/dcache/pool/classic/MoverExecutorService.java

@@ -11,6 +11,7 @@
 import dmg.cells.nucleus.CellPath;
 import dmg.cells.nucleus.NoRouteToCellException;
 import java.io.IOException;
+import java.nio.channels.CompletionHandler;
 import org.dcache.pool.FaultListener;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

modules/dcache/src/main/java/org/dcache/pool/classic/PoolIORequest.java

@@ -22,6 +22,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import dmg.cells.nucleus.CDC;
+import java.nio.channels.CompletionHandler;
 
 /**
  *