mem-pool: Pass the remote IKE address, to re-acquire() an address during reauth

With make-before-break IKEv2 re-authentication, virtual IP addresses must be
assigned overlapping to the same peer. With the remote IKE address, the backend
can detect re-authentication attempts by comparing the remote host address and
port. This allows proper reassignment of the virtual IP if it is re-requested.

This change removes the mem-pool.reassign_online option, as it is obsolete now.
IPs get automatically reassigned if a peer re-requests the same address, and
additionally connects from the same address and port.

src/libcharon/plugins/load_tester/load_tester_config.c

@@ -618,7 +618,7 @@ static host_t *allocate_addr(private_load_tester_config_t *this, uint num)
 	enumerator = this->pools->create_enumerator(this->pools);
 	while (enumerator->enumerate(enumerator, &pool))
 	{
-		found = pool->acquire_address(pool, id, requested, MEM_POOL_NEW);
+		found = pool->acquire_address(pool, id, requested, MEM_POOL_NEW, NULL);
 		if (found)
 		{
 			iface = (char*)pool->get_name(pool);