This commit aims to add the openssl_certificate module.
This module allows a user to manage openssl certificates.
This module implement the notion of backend provider, making this module
extensible to anyone wish as long as a provider is coded for it.
The current three providers are the following:
* selfsigned: Allows a user to self signed a certificate
* acme: Allow a user to generate acme-based CA challenges certificate.
(As of this writing this targets letsencrypt)
* assertonly: Allow a user to assert the characteristic of her SSL
certificate
Co-Authored-By: Markus Teufelberger <mteufelberger+ansible@mgit.at>