Correct an issue when stats use old stats (example network). Had also to deal...

Correct an issue when stats use old stats (example network). Had also to deal with the export CSV module not working.

glances/exports/glances_csv.py

@@ -90,6 +90,7 @@ class Export(GlancesExport):
 
         # Loop over plugins to export
         for plugin in self.plugins_to_export():
+            csv_data += [plugin]
             if isinstance(all_stats[plugin], list):
                 for stat in all_stats[plugin]:
                     # First line: header