[3504b] Added new DHCP4_RELEASE_FAIL_NO_SUBNET message

src/bin/dhcp4/dhcp4_messages.mes

@@ -504,6 +504,13 @@ first argument includes the client and the transaction identification
 information. The second argument holds the IP address which release
 was attempted.
 
+% DHCP4_RELEASE_FAIL_NO_SUBNET %1: client is trying to release a lease %2
+from a subnet which cannot be selected. This warning message indicates
+that client tried to release an address from an improper location.
+The first argument contains the client and transaction identification
+information. The second argument contains the address which the client
+is trying to release.
+
 % DHCP4_RELEASE_FAIL_NO_LEASE %1: client is trying to release non-existing lease %2
 This debug message is printed when client attempts to release a lease,
 but no such lease is known to the server. The first argument contains