Added mbedtls_net_close and use it in ssl_fork_server to correctly
disassociate the client socket from the parent process and the server
socket from the child process.
diff --git a/include/mbedtls/net_sockets.h b/include/mbedtls/net_sockets.h
index df42b45..adb589e 100644
--- a/include/mbedtls/net_sockets.h
+++ b/include/mbedtls/net_sockets.h
@@ -258,6 +258,13 @@
                       uint32_t timeout );
 
 /**
+ * \brief          Closes down the connection and free associated data
+ *
+ * \param ctx      The context to close
+ */
+void mbedtls_net_close( mbedtls_net_context *ctx );
+
+/**
  * \brief          Gracefully shutdown the connection and free associated data
  *
  * \param ctx      The context to free