fix(roles/_common): Fix non-boolean conditionals

This modifies the _common role to use a working conditional for newer
ansible versions. Without the fix, you receive the following error:

```
Conditional result was '[...]' of type 'str', which evaluates to True. Conditionals must have a boolean result.
```

Signed-off-by: Sol Jerome <[email protected]>

Author: solj

roles/_common/tasks/configure.yml

@@ -33,7 +33,7 @@
   become: true
   notify:
     - "{{ ansible_parent_role_names | first }} : Restart {{ _common_service_name }}"
-  when: (_common_config_dir)
+  when: _common_config_dir is defined
   tags:
     - "{{ ansible_parent_role_names | first | regex_replace(ansible_collection_name ~ '.', '') }}"
     - configure

roles/_common/tasks/install.yml

@@ -81,7 +81,7 @@
     - name: "Verify checksum of {{ __common_binary_basename }}"
       run_once: true
       check_mode: false
-      when: (_common_checksums_url)
+      when: _common_checksums_url is defined
       block:
         - name: "Fetch checksum list for {{ __common_binary_basename }}"
           ansible.builtin.uri:

roles/_common/tasks/preflight.yml

@@ -57,7 +57,7 @@
   ansible.builtin.package:
     name: "{{ _common_dependencies }}"
     state: present
-  when: (_common_dependencies)
+  when: _common_dependencies is defined
   tags:
     - "{{ ansible_parent_role_names | first | regex_replace(ansible_collection_name ~ '.', '') }}"
     - configure
@@ -84,4 +84,4 @@
           reject('match', '.+:\\d+$') |
           list |
           length == 0
-  when: (_common_web_listen_address)
+  when: _common_web_listen_address is defined