feat: uniform system.content source schema across installers and repositories

roles/configuration/tasks/fstab.yml

@@ -26,7 +26,7 @@
 - name: Remove RHEL ISO fstab entry when not using local repo
   when:
     - os == "rhel"
-    - system_cfg.features.rhel_repo.source != "iso"
+    - system_cfg.content.source != "dvd"
   ansible.builtin.lineinfile:
     path: /mnt/etc/fstab
     regexp: "^.*\\/dvd.*$"
@@ -35,7 +35,7 @@
 - name: Replace ISO UUID entry with /dev/sr0 in fstab
   when:
     - os == "rhel"
-    - system_cfg.features.rhel_repo.source == "iso"
+    - system_cfg.content.source == "dvd"
   vars:
     configuration_fstab_dvd_line: >-
       {{
@@ -53,7 +53,7 @@
   when:
     - os == "rhel"
     - hypervisor_type == "vmware"
-    - system_cfg.features.rhel_repo.source == "iso"
+    - system_cfg.content.source == "dvd"
   ansible.builtin.command:
     argv:
       - dd