fix ansible_lint issues

Use prefix for role variables, have an ending newline at the end of
files and use changed_when for command.
Also exclude *.sops.yaml files from ansible-lint.

roles/deploy_ssh_server_config/tasks/main.yaml

@@ -27,8 +27,8 @@
             mv /etc/ssh/moduli.tmp /etc/ssh/moduli
             echo "ansible-changed: changed /etc/ssh/moduli"
           fi
-      register: result
+      register: deploy_ssh_server_config__result
       changed_when:
-        - '"ansible-changed" in result.stdout'
+        - '"ansible-changed" in deploy_ssh_server_config__result.stdout'
       notify:
         - restart the ssh service