java_keystore: New ssl_backend option for cryptography (#2485)

* Adding cryptography as a backend for OpenSSL operations

* Updating unit tests and adding changelog fragment

* Allowing private key password option when using unprotected key

* Incorporating suggestions from initial review

* Centralizing module exit path

tests/integration/targets/java_keystore/tasks/main.yml

@@ -9,12 +9,22 @@
     - name: Include tasks to create ssl materials on the controller
       include_tasks: prepare.yml
 
+- set_fact:
+    ssl_backends: ['openssl']
+
+- set_fact:
+    ssl_backends: "{{ ssl_backends + ['cryptography'] }}"
+  when: cryptography_version.stdout is version('3.0', '>=')
+
 - when: has_java_keytool
   block:
     - name: Include tasks to play with 'certificate' and 'private_key' contents
       include_tasks: tests.yml
       vars:
         remote_cert: false
+      loop: "{{ ssl_backends }}"
+      loop_control:
+        loop_var: ssl_backend
 
     - name: Include tasks to create ssl materials on the remote host
       include_tasks: prepare.yml
@@ -23,3 +33,6 @@
       include_tasks: tests.yml
       vars:
         remote_cert: true
+      loop: "{{ ssl_backends }}"
+      loop_control:
+        loop_var: ssl_backend