Fix stable-1 for new cryptography 37.0.0 release (#446)

* Fix empty check for openssl_pkcs12 tests.

* 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/module_backends/csr.py

@@ -63,7 +63,7 @@ try:
     import OpenSSL
     from OpenSSL import crypto
     PYOPENSSL_VERSION = LooseVersion(OpenSSL.__version__)
-except ImportError:
+except (ImportError, AttributeError):
     PYOPENSSL_IMP_ERR = traceback.format_exc()
     PYOPENSSL_FOUND = False
 else: