server: sync templates on adding new secondary storage (#3302)

Fixes #2689

With the current code, existing templates were not downloaded to the new secondary storage when it is added. SSVM needed to be restarted to start the download process. This PR starts templates sync for the new secondary storage when it is added.

Signed-off-by: Abhishek Kumar <abhishek.kumar@shapeblue.com>

Author: shwstppr

server/src/main/java/com/cloud/storage/StorageManagerImpl.java

@@ -80,6 +80,7 @@
 import org.apache.cloudstack.framework.config.Configurable;
 import org.apache.cloudstack.framework.config.dao.ConfigurationDao;
 import org.apache.cloudstack.managed.context.ManagedContextRunnable;
+import org.apache.cloudstack.management.ManagementServerHost;
 import org.apache.cloudstack.storage.command.DettachCommand;
 import org.apache.cloudstack.storage.datastore.db.ImageStoreDao;
 import org.apache.cloudstack.storage.datastore.db.ImageStoreDetailsDao;
@@ -115,7 +116,6 @@
 import com.cloud.capacity.CapacityVO;
 import com.cloud.capacity.dao.CapacityDao;
 import com.cloud.cluster.ClusterManagerListener;
-import org.apache.cloudstack.management.ManagementServerHost;
 import com.cloud.configuration.Config;
 import com.cloud.configuration.ConfigurationManager;
 import com.cloud.configuration.ConfigurationManagerImpl;
@@ -2096,6 +2096,7 @@ public ImageStore discoverImageStore(String name, String url, String providerNam
         } else {
             // populate template_store_ref table
             _imageSrv.addSystemVMTemplatesToSecondary(store);
+            _imageSrv.handleTemplateSync(store);
         }
 
         // associate builtin template with zones associated with this image store