Fix main for new cryptography 37.0.0 release (#445)

* Fix empty check for openssl_pkcs12 tests.

* Remove unnecessary imports.

* Prevent crash if PyOpenSSL cannot be imported because of an AttributeError.

* Add changelog fragment.

* Fix constraints file.

* Use Python 2.7 instead of 3.5 for 2.9 cloud tests (pip module is broken).

* Prevent upgrading cryptography on ansible-core 2.12's default container with Python 3.9.

plugins/module_utils/ecs/api.py

@@ -34,7 +34,6 @@ __metaclass__ = type
 import json
 import os
 import re
-import time
 import traceback
 
 from ansible.module_utils.common.text.converters import to_text, to_native