config_method split into config_method and config_method_with_cred<>

lib/TTLS/include/Credentials.h

@@ -36,7 +36,7 @@ namespace eap
 
 namespace eap
 {
-    class credentials_ttls : public credentials_tls
+    class credentials_ttls : public credentials
     {
     public:
         ///
@@ -189,6 +189,7 @@ namespace eap
         /// @}
 
     public:
+        credentials_tls m_outer;                ///< Outer credentials
         std::unique_ptr<credentials> m_inner;   ///< Inner credentials
     };
 }