Adjust indentation of help strings

Uses backspace character (\b) because argparse does not provide any way
to override the amount of indentation.

Although argparse.HelpFormatter exposes an option for the amount of
indendation, it is undocumented and not part of the public interface.

Signed-off-by: John Pennycook <john.pennycook@intel.com>

Author: Pennycook

bin/codebasin

@@ -40,6 +40,10 @@ def _help_string(*lines: str, is_long=False, is_last=False):
     if not is_long:
         result = "\n"
 
+    # argparse.HelpFormatter indents by 24 characters.
+    # We cannot override this directly, but can delete them with backspaces.
+    lines = ["\b" * 20 + x for x in lines]
+
     # The additional space is required for argparse to respect newlines.
     result += "\n".join(lines)