Converted all package.html files to package-info.java for easier package documentation.
diff --git a/core/trivial/src/main/java/org/onlab/onos/net/trivial/link/impl/package-info.java b/core/trivial/src/main/java/org/onlab/onos/net/trivial/link/impl/package-info.java
new file mode 100644
index 0000000..09279a7
--- /dev/null
+++ b/core/trivial/src/main/java/org/onlab/onos/net/trivial/link/impl/package-info.java
@@ -0,0 +1,4 @@
+/**
+ * Core subsystem for tracking infrastructure links.
+ */
+package org.onlab.onos.net.trivial.link.impl;