nfsv41: reactivate expired session even if there was a state associated with it

src/org/dcache/chimera/nfs/v4/NFS4Client.java

@@ -224,6 +224,7 @@ public class NFS4Client {
 
         long curentTime = System.currentTimeMillis();
         if ((curentTime - _cl_time) > _leaseTime) {
+            _clientStates.clear();
             throw new ChimeraNFSException(nfsstat.NFSERR_EXPIRED, "lease time expired");
         }
         _cl_time = curentTime;

src/org/dcache/chimera/nfs/v4/OperationEXCHANGE_ID.java

@@ -182,9 +182,7 @@ public class OperationEXCHANGE_ID extends AbstractNFSv4Operation {
                 if (client.isConfirmed()) {
                     if (client.verifierEquals(verifier) && principal.equals(client.principal())) {
                         _log.debug("Case 2: Non-Update on Existing Client ID");
-                        if (!client.hasState()) {
-                            client.refreshLeaseTime();
-                        }
+                        client.refreshLeaseTime();
                     } else if (principal.equals(client.principal())) {
                         _log.debug("case 5: Client Restart");
                         stateHandler.removeClient(client);