Work on issues found by pylint (#896)

* Look at possibly-used-before-assignment.

* Use latest beta releases of ansible-core 2.19 for mypy and pylint.

* Look at unsupported-*.

* Look at unknown-option-value.

* Look at redefined-builtin.

* Look at superfluous-parens.

* Look at unspecified-encoding.

* Adjust to new cryptography version and to ansible-core 2.17's pylint.

* Look at super-with-arguments.

* Look at no-else-*.

* Look at try-except-raise.

* Look at inconsistent-return-statements.

* Look at redefined-outer-name.

* Look at redefined-argument-from-local.

* Look at attribute-defined-outside-init.

* Look at unused-variable.

* Look at protected-access.

* Look at raise-missing-from.

* Look at arguments-differ.

* Look at useless-suppression and use-symbolic-message-instead.

* Look at consider-using-dict-items.

* Look at consider-using-in.

* Look at consider-using-set-comprehension.

* Look at consider-using-with.

* Look at use-dict-literal.

plugins/module_utils/_acme/utils.py

@@ -60,13 +60,13 @@ def pem_to_der(
         lines = pem_content.splitlines()
     elif pem_filename is not None:
         try:
-            with open(pem_filename, "rt") as f:
+            with open(pem_filename, "r", encoding="utf-8") as f:
                 lines = list(f)
         except Exception as err:
             raise ModuleFailException(
                 f"cannot load PEM file {pem_filename}: {err}",
                 exception=traceback.format_exc(),
-            )
+            ) from err
     else:
         raise ModuleFailException(
             "One of pem_filename and pem_content must be provided"