Change code base on comments

Remove client certificate verify in tests.
Change the layout of structure to fix abi_api check issues.
Add comments of Finished.
Align with the coding styles.

Signed-off-by: XiaokangQian <xiaokang.qian@arm.com>
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 89cc051..45e0544 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -1124,10 +1124,6 @@
      * to be studied whether one of them can be removed. */
     unsigned char MBEDTLS_PRIVATE(minor_ver);    /*!< The TLS version used in the session. */
 
-#if defined(MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL)
-    mbedtls_ssl_tls1_3_application_secrets MBEDTLS_PRIVATE(app_secrets);
-#endif
-
 #if defined(MBEDTLS_X509_CRT_PARSE_C)
 #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
     mbedtls_x509_crt *MBEDTLS_PRIVATE(peer_cert);       /*!< peer X.509 cert chain */
@@ -1154,6 +1150,10 @@
 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
     int MBEDTLS_PRIVATE(encrypt_then_mac);       /*!< flag for EtM activation                */
 #endif
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL)
+    mbedtls_ssl_tls1_3_application_secrets MBEDTLS_PRIVATE(app_secrets);
+#endif
 };
 
 /*