Bug#23981 memory leaks from yassl code + other

 - Fix memory leak in vio_VioSSLFD that occurs when one of the calls to SSL_* function fails. As in the "ssl_des"
   test case where the server is currently not supposed to be able to read the specific cert/key file.
 - Change error message to be generic as it's called both from server and client code.

vio/viosslfactories.c

@@ -86,8 +86,7 @@ vio_set_cert_stuff(SSL_CTX *ctx, const char *cert_file, const char *key_file)
     if (SSL_CTX_use_certificate_file(ctx, cert_file, SSL_FILETYPE_PEM) <= 0)
     {
       DBUG_PRINT("error",("unable to get certificate from '%s'\n", cert_file));
-      /* FIX stderr */
-      fprintf(stderr,"Error when connection to server using SSL:");
+      fprintf(stderr,"SSL error: ");
       ERR_print_errors_fp(stderr);
       fprintf(stderr,"Unable to get certificate from '%s'\n", cert_file);
       fflush(stderr);
@@ -100,8 +99,7 @@ vio_set_cert_stuff(SSL_CTX *ctx, const char *cert_file, const char *key_file)
     if (SSL_CTX_use_PrivateKey_file(ctx, key_file, SSL_FILETYPE_PEM) <= 0)
     {
       DBUG_PRINT("error", ("unable to get private key from '%s'\n", key_file));
-      /* FIX stderr */
-      fprintf(stderr,"Error when connection to server using SSL:");
+      fprintf(stderr,"SSL error: ");
       ERR_print_errors_fp(stderr);
       fprintf(stderr,"Unable to get private key from '%s'\n", key_file);
       fflush(stderr);
@@ -252,6 +250,7 @@ new_VioSSLFd(const char *key_file, const char *cert_file,
   {
     DBUG_PRINT("error", ("failed to set ciphers to use"));
     report_errors();
+    SSL_CTX_free(ssl_fd->ssl_context);
     my_free((void*)ssl_fd,MYF(0));
     DBUG_RETURN(0);
   }
@@ -264,6 +263,7 @@ new_VioSSLFd(const char *key_file, const char *cert_file,
     {
       DBUG_PRINT("error", ("SSL_CTX_set_default_verify_paths failed"));
       report_errors();
+      SSL_CTX_free(ssl_fd->ssl_context);
       my_free((void*)ssl_fd,MYF(0));
       DBUG_RETURN(0);
     }
@@ -273,6 +273,7 @@ new_VioSSLFd(const char *key_file, const char *cert_file,
   {
     DBUG_PRINT("error", ("vio_set_cert_stuff failed"));
     report_errors();
+    SSL_CTX_free(ssl_fd->ssl_context);
     my_free((void*)ssl_fd,MYF(0));
     DBUG_RETURN(0);
   }