Update resource manager API and objects.
diff --git a/core/api/src/main/java/org/onlab/onos/net/resource/ResourceRequest.java b/core/api/src/main/java/org/onlab/onos/net/resource/ResourceRequest.java
new file mode 100644
index 0000000..bc3d904
--- /dev/null
+++ b/core/api/src/main/java/org/onlab/onos/net/resource/ResourceRequest.java
@@ -0,0 +1,8 @@
+package org.onlab.onos.net.resource;
+
+/**
+ * Abstraction of resource request.
+ */
+public interface ResourceRequest {
+
+}