Comment for why we have checksum and checksum_s

v2/ansible/utils/hashing.py

@@ -66,6 +66,7 @@ def secure_hash(filename, hash_func=sha1):
         raise errors.AnsibleError("error while accessing the file %s, error was: %s" % (filename, e))
     return digest.hexdigest()
 
+# The checksum algorithm must match with the algorithm in ShellModule.checksum() method
 checksum = secure_hash
 checksum_s = secure_hash_s