Returns several useful information about Qcow2 file

This script can returns:
- the number of allocated clusters in a Qcow file.
- the number of newly allocated clusters in a Qcow file
  compared to a reference one (like the backing file).

It can also cleanup a Qcow2 file by removing all data and set all
clusters as unallocated.

Signed-off-by: Guillaume <guillaume.thouvenin@vates.tech>

scripts/qcow_util.py

@@ -421,7 +421,7 @@ def print_help() -> NoReturn:
 
 Params:
    - All command takes a qcow file. Only diff takes a backing file and a qcow.
-     """
+"""
     print(help_msg)
     sys.exit(1)