Fix path resolution in trigger menu services (ATR-20864)

• remove path resolution from one more place in python
• move path resolution in C++ to base class ConfigSvcBase to avoid modification of property and code duplication
• includes commit from @fwinkl from MR !33590 (closed) (prints error if the PathResolver input is an absolute path)

Related to ATR-20864

Tools/PathResolver/Root/PathResolver.cxx

 /*
-  Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
 */
 
 #include "PathResolver/PathResolver.h"
@@ -203,6 +203,12 @@ PathResolver::find_file(const std::string& logical_file_name,
   System::getEnv(search_path, path_list);
 #endif
 
+#ifndef XAOD_ANALYSIS
+  if (!logical_file_name.empty() && logical_file_name[0]=='/') {
+    msg(MSG::ERROR) << "Use of an absolute file name: " << logical_file_name << endmsg;
+  }
+#endif
+
   return (find_file_from_list (logical_file_name, path_list, search_type));
 }