NullLinkProvider has been rewritten to take a topology file.

Reference: ONOS-1214, ONOS-1033

Change-Id: Ia945e4c8555afd2d74f174e51e22e2fdf3dcb356
diff --git a/tools/package/etc/samples/org.onosproject.provider.nil.link.impl.NullLinkProvider.cfg b/tools/package/etc/samples/org.onosproject.provider.nil.link.impl.NullLinkProvider.cfg
index dd8d323..ef72b1e 100644
--- a/tools/package/etc/samples/org.onosproject.provider.nil.link.impl.NullLinkProvider.cfg
+++ b/tools/package/etc/samples/org.onosproject.provider.nil.link.impl.NullLinkProvider.cfg
@@ -4,13 +4,13 @@
 
 #
 # If enabled, sets the time between LinkEvent generation,
-# in milliseconds.
+# in microseconds.
 #
 
-#eventRate = 100000
-
+#eventRate = 1000000
 
 #
-# Set order of islands to chain together, in a line.
+# If enabled, points to the full path to the topology file.
 #
-neighbors = 192.168.97.132,192.168.97.131
+
+#cfgFile = /tmp/foo.cfg