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/crypto/support.py

@@ -32,7 +32,7 @@ from ansible.module_utils.common.text.converters import to_native, to_bytes
 try:
     from OpenSSL import crypto
     HAS_PYOPENSSL = True
-except ImportError:
+except (ImportError, AttributeError):
     # Error handled in the calling module.
     HAS_PYOPENSSL = False