Implement REST APIs for flows:

- get all flows
- get all flows for a device
- get all flows for a device with a given ID

Change-Id: Ifb1541e4ae4a7e49f1347b34bef2fe788902368d
diff --git a/web/api/src/main/webapp/WEB-INF/web.xml b/web/api/src/main/webapp/WEB-INF/web.xml
index 724f56b..7f4c5ed 100644
--- a/web/api/src/main/webapp/WEB-INF/web.xml
+++ b/web/api/src/main/webapp/WEB-INF/web.xml
@@ -39,6 +39,7 @@
                 org.onosproject.rest.LinksWebResource,
                 org.onosproject.rest.HostsWebResource,
                 org.onosproject.rest.IntentsWebResource,
+                org.onosproject.rest.FlowsWebResource,
                 org.onosproject.rest.ConfigResource
             </param-value>
         </init-param>