Fix AIA validation, log all 'enomem', use tmp files at http downloads

Fix AIA validation, log all 'enomem', use tmp files at http downloads

+The AIA validation flow didn't considered entirely the scenario where a TA child AIA extension didn't matched the actual location from where the TA was fetched (common case: when its downloaded from an HTTPS URI), so despite the TA actually existed it wasn't considered when the validator was working with local files.
+Replace all '-ENOMEM' return codes with the log function 'pr_enomem'.
+Use temporal files whenever an HTTPS file is being downloaded.
+Fix memory leak when working with local TA files.
+The message '{..} discarding any other validation results' is now sent to the operation log.
+Fix GCC 10 warning related to 'strncpy', use 'memcpy' instead.