Refactor openssl_privatekey module, move add openssl_privatekey_pipe module (#119)

* Move disk-independent parts of openssl_privatekey to module_utils and doc_fragments.

* Improve documentation.

* Add openssl_privatekey_pipe module.

* Fallback in case no fingerprints are returned.

* Prevent no_log=True for content to stop module from working correctly.

* Forgot version_added.

* Update copyright. All the interesting code is no longer in this file anyway.

* Remove file arguments.

* Add framework for action modules.

* Convert openssl_privatekey_pipe to action plugin.

* Linting.

* Bump version.

* Add return_current_key option.

* Add no_log to examples.

* Remove preparation for potential later extensibility (easy to re-add when needed).

* Fix deprecation version in docs.

* Use new ArgumentSpec object for AnsibleActionModule as well.

plugins/module_utils/crypto/module_backends/common.py

@@ -19,8 +19,9 @@ class ArgumentSpec:
         self.required_if = required_if or []
         self.required_by = required_by or {}
 
-    def create_ansible_module(self, **kwargs):
-        return AnsibleModule(
+    def create_ansible_module_helper(self, clazz, args, **kwargs):
+        return clazz(
+            *args,
             argument_spec=self.argument_spec,
             mutually_exclusive=self.mutually_exclusive,
             required_together=self.required_together,
@@ -28,3 +29,6 @@ class ArgumentSpec:
             required_if=self.required_if,
             required_by=self.required_by,
             **kwargs)
+
+    def create_ansible_module(self, **kwargs):
+        return self.create_ansible_module_helper(AnsibleModule, (), **kwargs)