test: update manifests for "rhel-8"

The format-request-map is updated to remove the override for the
customized qcow for rhel-8.
The rhel-8 manifests are now identical to the rhel-87 counterparts.

tools/test-case-generators/format-request-map.json

@@ -865,81 +865,6 @@
           ]
         }
       },
-      "rhel-8": {
-        "blueprint": {
-          "name": "qcow2-customize-boot-test",
-          "description": "Image for boot test",
-          "packages": [
-            {
-              "name": "bash",
-              "version": "*"
-            }
-          ],
-          "modules": [],
-          "groups": [
-            {
-              "name": "core"
-            }
-          ],
-          "customizations": {
-            "hostname": "my-host",
-            "kernel": {
-              "append": "debug"
-            },
-            "sshkey": [
-              {
-                "user": "user1",
-                "key": "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC61wMCjOSHwbVb4VfVyl5sn497qW4PsdQ7Ty7aD6wDNZ/QjjULkDV/yW5WjDlDQ7UqFH0Sr7vywjqDizUAqK7zM5FsUKsUXWHWwg/ehKg8j9xKcMv11AkFoUoujtfAujnKODkk58XSA9whPr7qcw3vPrmog680pnMSzf9LC7J6kXfs6lkoKfBh9VnlxusCrw2yg0qI1fHAZBLPx7mW6+me71QZsS6sVz8v8KXyrXsKTdnF50FjzHcK9HXDBtSJS5wA3fkcRYymJe0o6WMWNdgSRVpoSiWaHHmFgdMUJaYoCfhXzyl7LtNb3Q+Sveg+tJK7JaRXBLMUllOlJ6ll5Hod root@localhost"
-              }
-            ],
-            "user": [
-              {
-                "name": "user2",
-                "description": "description 2",
-                "password": "$6$BhyxFBgrEFh0VrPJ$MllG8auiU26x2pmzL4.1maHzPHrA.4gTdCvlATFp8HJU9UPee4zCS9BVl2HOzKaUYD/zEm8r/OF05F2icWB0K/",
-                "key": "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC61wMCjOSHwbVb4VfVyl5sn497qW4PsdQ7Ty7aD6wDNZ/QjjULkDV/yW5WjDlDQ7UqFH0Sr7vywjqDizUAqK7zM5FsUKsUXWHWwg/ehKg8j9xKcMv11AkFoUoujtfAujnKODkk58XSA9whPr7qcw3vPrmog680pnMSzf9LC7J6kXfs6lkoKfBh9VnlxusCrw2yg0qI1fHAZBLPx7mW6+me71QZsS6sVz8v8KXyrXsKTdnF50FjzHcK9HXDBtSJS5wA3fkcRYymJe0o6WMWNdgSRVpoSiWaHHmFgdMUJaYoCfhXzyl7LtNb3Q+Sveg+tJK7JaRXBLMUllOlJ6ll5Hod root@localhost",
-                "home": "/home/home2",
-                "shell": "/bin/sh",
-                "groups": [
-                  "group1"
-                ],
-                "uid": 1020,
-                "gid": 1050
-              }
-            ],
-            "group": [
-              {
-                "name": "group1",
-                "gid": 1030
-              },
-              {
-                "name": "group2",
-                "gid": 1050
-              }
-            ],
-            "timezone": {
-              "timezone": "Europe/London",
-              "ntpservers": [
-                "time.example.com"
-              ]
-            },
-            "locale": {
-              "languages": [
-                "el_CY.UTF-8"
-              ],
-              "keyboard": "dvorak"
-            },
-            "services": {
-              "enabled": [
-                "sshd.socket"
-              ],
-              "disabled": [
-                "bluetooth.service"
-              ]
-            }
-          }
-        }
-      },
       "rhel-84": {
         "blueprint": {
           "name": "qcow2-customize-boot-test",