Devices,hosts, and links can be blocked and kicked off with the network configuration api

Change-Id: I68d427f4886a7b63475df8d35383e2e347946946
diff --git a/providers/lldp/src/main/java/org/onosproject/provider/lldp/impl/LinkDiscovery.java b/providers/lldp/src/main/java/org/onosproject/provider/lldp/impl/LinkDiscovery.java
index 6f3ffdc..edf9a7b 100644
--- a/providers/lldp/src/main/java/org/onosproject/provider/lldp/impl/LinkDiscovery.java
+++ b/providers/lldp/src/main/java/org/onosproject/provider/lldp/impl/LinkDiscovery.java
@@ -229,7 +229,12 @@
             } else {
                 ld = new DefaultLinkDescription(src, dst, Type.DIRECT);
             }
-            linkProvider.linkDetected(ld);
+
+            try {
+                linkProvider.linkDetected(ld);
+            } catch (IllegalStateException e) {
+                return true;
+            }
             return true;
         }
         return false;