hadoop: remove deprecation warning

The routine cannot be fully removed yet because it
still exists as an abstract function in FileSystem class.

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>

src/client/hadoop/ceph/CephFileSystem.java

@@ -646,6 +646,7 @@ public class CephFileSystem extends FileSystem {
     return locations;
   }
 
+  @Deprecated
 	public boolean delete(Path path) throws IOException {
 		return delete(path, false);
 	}