let parse_args only parse, no continuation

This removes parse_args() from the call stack
It pushes down the test-mocking one level [from parse_args() to main()].
Moves parse_args into a more generic 'modules' parsing direction.

freqtrade/misc.py

@@ -136,14 +136,7 @@ def parse_args(args: List[str], description: str):
     )
 
     build_subcommands(parser)
-    parsed_args = parser.parse_args(args)
-
-    # No subcommand as been selected
-    if not hasattr(parsed_args, 'func'):
-        return parsed_args
-
-    parsed_args.func(parsed_args)
-    return None
+    return parser.parse_args(args)
 
 
 def build_subcommands(parser: argparse.ArgumentParser) -> None: