Fix for Host2Host Intent issue.

- installing HostToHostIntent was failing on multi-instance cluster

Change-Id: Ib473a49459c333bfbe74fbcec8363473739cf424

@@ -241,6 +241,7 @@ public class PathIntent extends ConnectivityIntent {
     }
 
     // for path protection purposes
+    @Beta
     public enum ProtectionType {
         /**
          * Intent within primary path.

@@ -547,6 +547,7 @@ public final class KryoNamespaces {
             .register(ClosedOpenRange.class)
             .register(DiscreteResourceCodec.class)
             .register(new ImmutableByteSequenceSerializer(), ImmutableByteSequence.class)
+            .register(PathIntent.ProtectionType.class)
             .build("API");
 
     /**