Move IntentUpdate subclasses to the dedicated package

Resolve ONOS-1051
- Create package "phase" under intent.impl
- Rename IntentUpdate and CompletedIntentUpdate
  - IntentUpdate -> IntentProcessPhase
  - CompletedIntentUpdate -> FinalIntentProcessPhase
- Loosen method/field visibility as short term hack

Change-Id: Idc0fd9a74aadd227d62006d00fee473c63b1fc05
diff --git a/core/net/src/main/java/org/onosproject/net/intent/impl/phase/Withdrawn.java b/core/net/src/main/java/org/onosproject/net/intent/impl/phase/Withdrawn.java
new file mode 100644
index 0000000..069a989
--- /dev/null
+++ b/core/net/src/main/java/org/onosproject/net/intent/impl/phase/Withdrawn.java
@@ -0,0 +1,44 @@
+/*
+ * 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.intent.impl.phase;
+
+import org.onosproject.net.intent.IntentData;
+import org.onosproject.net.intent.IntentState;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.onosproject.net.intent.IntentState.WITHDRAWING;
+
+/**
+ * Represents a phase where an intent has been withdrawn.
+ */
+public final class Withdrawn extends FinalIntentProcessPhase {
+
+    private final IntentData intentData;
+
+    public Withdrawn(IntentData intentData) {
+        this(intentData, WITHDRAWING);
+    }
+
+    public Withdrawn(IntentData intentData, IntentState newState) {
+        this.intentData = checkNotNull(intentData);
+        this.intentData.setState(newState);
+    }
+
+    @Override
+    public IntentData data() {
+        return intentData;
+    }
+}