Fixing up imports (I've been falling down on my job).

Note:  I didn't touch routerconsole since it isn't done (I believe)
-- Love, shendaras

core/java/src/net/i2p/client/I2CPMessageProducer.java

@@ -9,7 +9,6 @@ package net.i2p.client;
  *
  */
 
-import java.util.HashSet;
 import java.util.Set;
 
 import net.i2p.I2PAppContext;

core/java/src/net/i2p/stat/Rate.java

@@ -1,7 +1,6 @@
 package net.i2p.stat;
 
 import java.io.IOException;
-import java.io.OutputStream;
 import java.util.Properties;
 
 import net.i2p.util.Clock;