refactor(bootstrap,configuration): add per-role _normalize.yml for platform resolution

roles/bootstrap/tasks/main.yml

@@ -1,6 +1,9 @@
 ---
+- name: Normalize bootstrap
+  ansible.builtin.import_tasks: _normalize.yml
+
 - name: Create API filesystem mountpoints in installroot
-  when: is_rhel | bool
+  when: os_family == 'RedHat'
   ansible.builtin.file:
     path: "/mnt/{{ item }}"
     state: directory
@@ -11,7 +14,7 @@
     - sys
 
 - name: Mount API filesystems into installroot
-  when: is_rhel | bool
+  when: os_family == 'RedHat'
   ansible.posix.mount:
     src: "{{ item.src }}"
     path: "/mnt/{{ item.path }}"