Replace include usage with include_tasks and import_tasks

The long-deprecated (since Ansible 2.4) use of include is
no more.

roles/matrix-server/tasks/setup/ssl/main.yml

@@ -31,8 +31,8 @@
 
 # Method specific tasks follow
 
-- include: tasks/setup/ssl/setup_ssl_lets_encrypt.yml
+- import_tasks: tasks/setup/ssl/setup_ssl_lets_encrypt.yml
 
-- include: tasks/setup/ssl/setup_ssl_self_signed.yml
+- import_tasks: tasks/setup/ssl/setup_ssl_self_signed.yml
 
-- include: tasks/setup/ssl/setup_ssl_manually_managed.yml
+- import_tasks: tasks/setup/ssl/setup_ssl_manually_managed.yml

roles/matrix-server/tasks/setup/ssl/setup_ssl_lets_encrypt.yml

@@ -26,7 +26,7 @@
   when: "matrix_ssl_retrieval_method == 'lets-encrypt'"
 
 - name: Obtain Let's Encrypt certificates
-  include_tasks: "tasks/setup/ssl/setup_ssl_lets_encrypt_obtain_for_domain.yml"
+  include_tasks: "{{ role_path }}/tasks/setup/ssl/setup_ssl_lets_encrypt_obtain_for_domain.yml"
   with_items: "{{ domains_requiring_certificates }}"
   loop_control:
     loop_var: domain_name

roles/matrix-server/tasks/setup/ssl/setup_ssl_manually_managed.yml

@@ -1,7 +1,7 @@
 ---
 
 - name: Verify certificates
-  include_tasks: "tasks/setup/ssl/setup_ssl_manually_managed_verify_for_domain.yml"
+  include_tasks: "{{ role_path }}/tasks/setup/ssl/setup_ssl_manually_managed_verify_for_domain.yml"
   with_items: "{{ domains_requiring_certificates }}"
   loop_control:
     loop_var: domain_name

roles/matrix-server/tasks/setup/ssl/setup_ssl_self_signed.yml

@@ -17,7 +17,7 @@
   when: "matrix_ssl_retrieval_method == 'self-signed' and ansible_os_family == 'Debian'"
 
 - name: Generate self-signed certificates
-  include_tasks: "tasks/setup/ssl/setup_ssl_self_signed_obtain_for_domain.yml"
+  include_tasks: "{{ role_path }}/tasks/setup/ssl/setup_ssl_self_signed_obtain_for_domain.yml"
   with_items: "{{ domains_requiring_certificates }}"
   loop_control:
     loop_var: domain_name