Add REST API for query/update/delete/enable/disable telemetry config

1. Add unit test for newly added REST APIs
2. Add codec and unit tests for TelemetryConfig
3. Split web package out from app package due to dep conflict

Change-Id: I85f52b2a7d059622e98832843bc9613cb8befa98
diff --git a/apps/openstacktelemetry/web/src/test/java/org/onosproject/openstacktelemetry/web/OpenstackTelemetryCodecRegisterTest.java b/apps/openstacktelemetry/web/src/test/java/org/onosproject/openstacktelemetry/web/OpenstackTelemetryCodecRegisterTest.java
new file mode 100644
index 0000000..6eee616
--- /dev/null
+++ b/apps/openstacktelemetry/web/src/test/java/org/onosproject/openstacktelemetry/web/OpenstackTelemetryCodecRegisterTest.java
@@ -0,0 +1,98 @@
+/*
+ * Copyright 2018-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.openstacktelemetry.web;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Maps;
+import org.junit.Test;
+import org.onlab.junit.TestUtils;
+import org.onosproject.codec.CodecService;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.openstacktelemetry.api.FlowInfo;
+import org.onosproject.openstacktelemetry.api.StatsFlowRule;
+import org.onosproject.openstacktelemetry.api.StatsInfo;
+import org.onosproject.openstacktelemetry.api.config.TelemetryConfig;
+import org.onosproject.openstacktelemetry.codec.rest.FlowInfoJsonCodec;
+import org.onosproject.openstacktelemetry.codec.rest.StatsFlowRuleJsonCodec;
+import org.onosproject.openstacktelemetry.codec.rest.StatsInfoJsonCodec;
+import org.onosproject.openstacktelemetry.codec.rest.TelemetryConfigJsonCodec;
+
+import java.util.Map;
+import java.util.Set;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+/**
+ * Unit test for openstack telemetry codec register.
+ */
+public final class OpenstackTelemetryCodecRegisterTest {
+
+    private OpenstackTelemetryCodecRegister register;
+
+    /**
+     * Tests codec register activation and deactivation.
+     */
+    @Test
+    public void testActivateDeactivate() {
+        register = new OpenstackTelemetryCodecRegister();
+        CodecService codecService = new TestCodecService();
+
+        TestUtils.setField(register, "codecService", codecService);
+        register.activate();
+
+        assertEquals(StatsInfoJsonCodec.class.getName(),
+                codecService.getCodec(StatsInfo.class).getClass().getName());
+        assertEquals(FlowInfoJsonCodec.class.getName(),
+                codecService.getCodec(FlowInfo.class).getClass().getName());
+        assertEquals(StatsFlowRuleJsonCodec.class.getName(),
+                codecService.getCodec(StatsFlowRule.class).getClass().getName());
+        assertEquals(TelemetryConfigJsonCodec.class.getName(),
+                codecService.getCodec(TelemetryConfig.class).getClass().getName());
+
+        register.deactivate();
+
+        assertNull(codecService.getCodec(StatsInfo.class));
+        assertNull(codecService.getCodec(FlowInfo.class));
+        assertNull(codecService.getCodec(StatsFlowRule.class));
+        assertNull(codecService.getCodec(TelemetryConfig.class));
+    }
+
+    private static class TestCodecService implements CodecService {
+
+        private Map<String, JsonCodec> codecMap = Maps.newConcurrentMap();
+
+        @Override
+        public Set<Class<?>> getCodecs() {
+            return ImmutableSet.of();
+        }
+
+        @Override
+        public <T> JsonCodec<T> getCodec(Class<T> entityClass) {
+            return codecMap.get(entityClass.getName());
+        }
+
+        @Override
+        public <T> void registerCodec(Class<T> entityClass, JsonCodec<T> codec) {
+            codecMap.put(entityClass.getName(), codec);
+        }
+
+        @Override
+        public void unregisterCodec(Class<?> entityClass) {
+            codecMap.remove(entityClass.getName());
+        }
+    }
+}