Fix compilation of non-JUnit tests (disabled by default)

apps/streaming/java/test/junit/net/i2p/client/streaming/impl/StreamSinkTestClient.java

-package net.i2p.client.streaming;
+package net.i2p.client.streaming.impl;
 
+import net.i2p.client.streaming.I2PSocketManagerFactory;
+import net.i2p.client.streaming.StreamSinkSend;
 import net.i2p.client.streaming.impl.I2PSocketManagerFull;
 /**
  *

apps/streaming/java/test/junit/net/i2p/client/streaming/impl/StreamSinkTestServer.java

-package net.i2p.client.streaming;
+package net.i2p.client.streaming.impl;
 
+import net.i2p.client.streaming.I2PSocketManagerFactory;
+import net.i2p.client.streaming.StreamSinkServer;
 import net.i2p.client.streaming.impl.I2PSocketManagerFull;
 /**
  *

apps/streaming/java/test/junit/net/i2p/client/streaming/impl/StreamSinkTestStandalone.java

-package net.i2p.client.streaming;
+package net.i2p.client.streaming.impl;
 
+import net.i2p.client.streaming.I2PSocketManagerFactory;
+import net.i2p.client.streaming.StreamSinkClient;
+import net.i2p.client.streaming.StreamSinkSend;
+import net.i2p.client.streaming.StreamSinkServer;
 import net.i2p.client.streaming.impl.I2PSocketManagerFull;
 /**
  * Usage: StreamSinkTest [(old|new) [#hops [#kb]]]