Added javadocs and separated trivial implementations into distinct packages.
diff --git a/providers/of/link/src/main/java/org/onlab/onos/provider/of/link/impl/LinkDiscovery.java b/providers/of/link/src/main/java/org/onlab/onos/provider/of/link/impl/LinkDiscovery.java
index 2e8fa55..407ded1 100644
--- a/providers/of/link/src/main/java/org/onlab/onos/provider/of/link/impl/LinkDiscovery.java
+++ b/providers/of/link/src/main/java/org/onlab/onos/provider/of/link/impl/LinkDiscovery.java
@@ -42,7 +42,7 @@
 import org.onlab.packet.Ethernet;
 import org.onlab.packet.ONLabLddp;
 import org.onlab.packet.ONLabLddp.DPIDandPort;
-import org.onlab.timer.Timer;
+import org.onlab.util.Timer;
 import org.projectfloodlight.openflow.protocol.OFFactory;
 import org.projectfloodlight.openflow.protocol.OFMessage;
 import org.projectfloodlight.openflow.protocol.OFPacketOut;