useStaleLinkAge for VanishStaleLink

Also include gerrit #22247

Change-Id: Ifd8079172a096bef0edf89daca97395c2d35a5ce
diff --git a/providers/lldp/src/main/java/org/onosproject/provider/lldp/impl/OsgiPropertyConstants.java b/providers/lldp/src/main/java/org/onosproject/provider/lldp/impl/OsgiPropertyConstants.java
index 51bcd39..224ac7e 100644
--- a/providers/lldp/src/main/java/org/onosproject/provider/lldp/impl/OsgiPropertyConstants.java
+++ b/providers/lldp/src/main/java/org/onosproject/provider/lldp/impl/OsgiPropertyConstants.java
@@ -38,4 +38,7 @@
     public static final String PROP_DISCOVERY_DELAY = "maxDiscoveryDelayMs";
     public static final int DISCOVERY_DELAY_DEFAULT = 1000;
 
+    public static final String PROP_USE_STALE_LINK_AGE = "useStaleLinkAge";
+    public static final boolean USE_STALE_LINK_AGE_DEFAULT = true;
+
 }