asio: option to use wolfSSL as TLS stack for ASIO

Plus other minor update, make openssl aware of current modes (SSL_set_mode)
Update coding style in examples and tests, including copyright notices

components/openssl/include/openssl/err.h

@@ -22,8 +22,8 @@ extern "C" {
 #endif
 
 /**
- * @note This file contains a very simple implementation of error stack provided
- * OpenSSL library. It is OFF by default.
+ * @note This file contains a very simple implementation of error stack
+ * for ESP APIs stubs to OpenSSL
  */
 
 #define OPENSSL_PUT_SYSTEM_ERROR() \

components/openssl/include/openssl/ssl.h

@@ -22,7 +22,7 @@
 #include "internal/ssl_x509.h"
 #include "internal/ssl_pkey.h"
 #include "openssl/bio.h"
-#include "openssl/openssl_err.h"
+#include "openssl/err.h"
 
 /*
 {
@@ -1888,6 +1888,15 @@ openssl_verify_callback SSL_get_verify_callback(const SSL *s);
  */
 void RSA_free(RSA *r);
 
+/**
+ * @brief Sets SSL mode, partially implemented
+ *
+ * @param ssl SSL context
+ *
+ * @return the new mode bitmask after adding mode
+ */
+uint32_t SSL_set_mode(SSL *ssl, uint32_t mode);
+
 #ifdef __cplusplus
 }
 #endif