fix some ansible 2.8 deprecation warnings

tasks/install.yml

@@ -8,7 +8,7 @@
         baseurl: "https://nginx.org/packages/centos/{{ ansible_distribution_major_version }}/$basearch/"
         gpgkey: https://nginx.org/keys/nginx_signing.key
         gpgcheck: yes
-      when: nginx_official_repo_enabled
+      when: nginx_official_repo_enabled | bool
 
     - name: Installing nginx
       package:
@@ -81,7 +81,7 @@
         name: allow_nginx_ports
         state: present
         rules: '-A INPUT -p tcp -m multiport --dports {{ nginx_open_ports | join(",") }} -j ACCEPT'
-      when: nginx_iptables_enabled
+      when: nginx_iptables_enabled | bool
 
     - name: Set selinux booleans
       seboolean:
@@ -111,7 +111,7 @@
         owner: "{{ nginx_user }}"
         group: "{{ nginx_group }}"
         mode: 0750
-  when: nginx_default_page_enabled
+  when: nginx_default_page_enabled | bool
   become: True
   become_user: "{{ nginx_user }}"
 
@@ -133,6 +133,6 @@
         group: root
         state: link
       notify: __nginx_reload
-  when: nginx_default_page_enabled
+  when: nginx_default_page_enabled | bool
   become: True
   become_user: root

tasks/main.yml

@@ -1,6 +1,6 @@
 ---
 - import_tasks: install.yml
 - import_tasks: tls.yml
-  when: nginx_tls_enabled
+  when: nginx_tls_enabled | bool
   tags: tls_renewal
 - import_tasks: post_tasks.yml

tasks/tls.yml

@@ -11,7 +11,7 @@
       loop_control:
         label: "{{ item.dest }}"
       notify: __nginx_reload
-      when: nginx_tls_source_use_files
+      when: nginx_tls_source_use_files | bool
 
     - name: Create Diffie-Hellman Parameter
       openssl_dhparam: