Moved host core stuff to its own package.

-package org.onlab.onos.net.trivial.impl;
+package org.onlab.onos.net.trivial.host.impl;
 
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;

-package org.onlab.onos.net.trivial.impl;
+package org.onlab.onos.net.trivial.host.impl;
 
 import org.onlab.onos.net.ConnectPoint;
 import org.onlab.onos.net.DefaultHost;

@@ -32,7 +32,9 @@ import static org.onlab.util.Tools.namedThreads;
 import static org.slf4j.LoggerFactory.getLogger;
 
 /**
- * Simple implementation of a network topology provider/computor.
+ * Default implementation of a network topology provider that feeds off
+ * device and link subsystem events to trigger assembly and computation of
+ * new topology snapshots.
  */
 @Component(immediate = true)
 public class DefaultTopologyProvider extends AbstractProvider
@@ -76,7 +78,7 @@ public class DefaultTopologyProvider extends AbstractProvider
 
     @Activate
     public synchronized void activate() {
-        executor = newFixedThreadPool(MAX_THREADS, namedThreads("topo-compute-%d"));
+        executor = newFixedThreadPool(MAX_THREADS, namedThreads("topo-build-%d"));
         accumulator = new TopologyChangeAccumulator();
 
         providerService = providerRegistry.register(this);

@@ -5,7 +5,7 @@ import org.onlab.onos.net.DeviceId;
 import java.util.Objects;
 
 /**
- * Key for filing src/dst paths.
+ * Key for filing pre-computed paths between source and destination devices.
  */
 class PathKey {
     private final DeviceId src;

@@ -320,6 +320,7 @@
                 <artifactId>maven-javadoc-plugin</artifactId>
                 <version>2.9.1</version>
                 <configuration>
+                    <show>package</show>
                     <docfilessubdirs>true</docfilessubdirs>
                     <doctitle>ONOS Java API</doctitle>
                     <groups>

@@ -60,7 +60,7 @@ public class OpenFlowDeviceProvider extends AbstractProvider implements DevicePr
      * Creates an OpenFlow device provider.
      */
     public OpenFlowDeviceProvider() {
-        super(new ProviderId("org.onlab.onos.provider.of.device"));
+        super(new ProviderId("org.onlab.onos.provider.openflow"));
     }
 
     @Activate

@@ -37,7 +37,7 @@ public class OpenFlowHostProvider extends AbstractProvider implements HostProvid
      * Creates an OpenFlow host provider.
      */
     public OpenFlowHostProvider() {
-        super(new ProviderId("org.onlab.onos.provider.of.host"));
+        super(new ProviderId("org.onlab.onos.provider.openflow"));
     }
 
     @Activate

@@ -55,7 +55,7 @@ public class OpenFlowLinkProvider extends AbstractProvider implements LinkProvid
      * Creates an OpenFlow link provider.
      */
     public OpenFlowLinkProvider() {
-        super(new ProviderId("org.onlab.onos.provider.of.link"));
+        super(new ProviderId("org.onlab.onos.provider.openflow"));
     }
 
     @Activate