Phased recovery

- Implemented a set of CLI commands
    - Enable/disable group of ports
    - List recovery phase of each device
    - Force a specific device to enter given phase
- Return CompletableFuture in RRP
- Introduce completeAfter method in Tools
- Introduce submit method in PredictableExecutor which returns a CompletableFuture

Change-Id: I60b0fb7b67e392b33b52d908d2b53f7acbddc565
diff --git a/app/src/main/java/org/onosproject/segmentrouting/cli/PhaseCompleter.java b/app/src/main/java/org/onosproject/segmentrouting/cli/PhaseCompleter.java
new file mode 100644
index 0000000..bd16068
--- /dev/null
+++ b/app/src/main/java/org/onosproject/segmentrouting/cli/PhaseCompleter.java
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2014-present Open Networking Foundation
+ *
+ * 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.segmentrouting.cli;
+
+import com.google.common.collect.Lists;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+import org.onosproject.cli.AbstractChoicesCompleter;
+import org.onosproject.segmentrouting.phasedrecovery.api.Phase;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * Phase completer.
+ */
+@Service
+public class PhaseCompleter extends AbstractChoicesCompleter {
+    @Override
+    protected List<String> choices() {
+        return Lists.newArrayList(Phase.values()).stream().map(Enum::toString).collect(Collectors.toList());
+    }
+}