Bulk migration to Python 3.6 f-strings (ansible-collections#1810)

Bulk migration to Python 3.6 f-strings

SUMMARY
We've dropped support for Python <3.6, bulk migrate to fstrings and perform some general string cleanup
A combination of

black --preview
flynt
some manual cleanup

ISSUE TYPE

Feature Pull Request

COMPONENT NAME
plugins/
tests/
ADDITIONAL INFORMATION

Reviewed-by: Alina Buzachis

This commit was initially merged in https://github.com/ansible-collections/community.aws
See: ansible-collections@de33821

plugins/modules/iam_password_policy.py

@@ -112,7 +112,7 @@ def __init__(self, module):
             self.connection = module.resource("iam")
             self.module = module
         except Exception as e:
-            module.fail_json(msg="Failed to connect to AWS: %s" % str(e))
+            module.fail_json(msg=f"Failed to connect to AWS: {str(e)}")
 
     def policy_to_dict(self, policy):
         policy_attributes = [