Initial sketch of driver based configuration api.

Change-Id: I82468aea5d698b28a4fd996142f9c88d7a56e31f
diff --git a/core/api/src/main/java/org/onosproject/net/behaviour/PortConfig.java b/core/api/src/main/java/org/onosproject/net/behaviour/PortConfig.java
new file mode 100644
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+++ b/core/api/src/main/java/org/onosproject/net/behaviour/PortConfig.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.net.behaviour;
+
+import com.google.common.primitives.UnsignedInteger;
+import org.onosproject.net.PortNumber;
+
+/**
+ * Means to configure a logical port at the device.
+ */
+public interface PortConfig {
+
+    /**
+     * Apply QoS configuration on a device.
+     * @param port a port number
+     * @param queueId an unsigned integer
+     */
+    void applyQoS(PortNumber port, UnsignedInteger queueId);
+
+    /**
+     * Remove a QoS configuration.
+     * @param port a port number
+     */
+    void removeQoS(PortNumber port);
+
+    /**
+     * Enable/disable administratively a port.
+     * @param port a port number
+     * @param state a boolean indicating state
+     */
+    void setEnabled(PortNumber port, boolean state);
+
+}