NetconfAlarmProvider alerts core about notifications given subscription.

Change-Id: I7561ba680eb8bac33a8543d6aa1bccf6732e95db
diff --git a/protocols/netconf/ctl/src/main/java/org/onosproject/netconf/ctl/NetconfStreamHandler.java b/protocols/netconf/ctl/src/main/java/org/onosproject/netconf/ctl/NetconfStreamHandler.java
index 363657d..1ee7911 100644
--- a/protocols/netconf/ctl/src/main/java/org/onosproject/netconf/ctl/NetconfStreamHandler.java
+++ b/protocols/netconf/ctl/src/main/java/org/onosproject/netconf/ctl/NetconfStreamHandler.java
@@ -16,6 +16,7 @@
 
 package org.onosproject.netconf.ctl;
 
+import com.google.common.annotations.Beta;
 import org.onosproject.netconf.NetconfDeviceOutputEventListener;
 
 import java.util.concurrent.CompletableFuture;
@@ -46,4 +47,13 @@
      * @param listener Netconf device event listener
      */
     void removeDeviceEventListener(NetconfDeviceOutputEventListener listener);
+
+    @Beta
+    /**
+     * Sets instance variable that when true allows receipt of notifications.
+     *
+     * @param enableNotifications if true, allows action based off notifications
+     *                             else, stops action based off notifications
+     */
+    void setEnableNotifications(boolean enableNotifications);
 }