REPO-2626: Heartbeat: Add data collection to Community code

- Initial (bare) implementation of the new Data Collectors
    - The corresponding spring beans were NOT added.

src/main/java/org/alfresco/heartbeat/HBDataCollectorServiceImpl.java

@@ -0,0 +1,68 @@
+/*
+ * #%L
+ * Alfresco Repository
+ * %%
+ * Copyright (C) 2005 - 2017 Alfresco Software Limited
+ * %%
+ * This file is part of the Alfresco software. 
+ * If the software was purchased under a paid Alfresco license, the terms of 
+ * the paid license agreement will prevail.  Otherwise, the software is 
+ * provided under the following open source license terms:
+ * 
+ * Alfresco is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * Alfresco is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
+ * #L%
+ */
+package org.alfresco.heartbeat;
+
+import java.util.LinkedList;
+import java.util.List;
+
+import org.alfresco.service.cmr.repository.HBDataCollectorService;
+
+public class HBDataCollectorServiceImpl implements HBDataCollectorService
+{
+    private List<HBBaseDataCollector> collectors = new LinkedList<>();
+//    private HBDataSenderService dataSender;
+    private boolean enabled;
+
+    @Override
+    public void registerCollector(HBBaseDataCollector collector)
+    {
+        this.collectors.add(collector);
+    }
+
+    @Override
+    public void collectAndSendData()
+    {
+        for (HBBaseDataCollector collector : collectors)
+        {
+            List<HBData> data = collector.collectData();
+//            try
+//            {
+//                dataSender.sendData(data);
+//            }
+//            catch (Exception e)
+//            {
+//                // log exception;
+//            }
+        }
+    }
+
+    @Override
+    public boolean isHBEnabled()
+    {
+        return enabled;
+    }
+
+}