Add isort and flake8 to CI (#869)

* Run isort.

* Clean up unused assignments.

* Add flake8 linting step.

plugins/module_utils/crypto/_objects_data.py

@@ -15,6 +15,8 @@
 # https://github.com/openssl/openssl/blob/master/LICENSE.txt or LICENSES/Apache-2.0.txt
 
 from __future__ import absolute_import, division, print_function
+
+
 __metaclass__ = type