Description of problem:
When using the python version on RHEL 8, the route, dns and route rules stored in the interface can be shown.
In the future nmstate would store these global configurations in loopback connection, this bug is for tracking in case we need a workaround before https://bugzilla.redhat.com/show_bug.cgi?id=2060905 implements.

Version-Release number of selected component (if applicable):
nmstate-2.1.1-0.alpha.20220519.437e4a9.el9.x86_64

How reproducible:
100%

Steps to Reproduce:
echo "dns-resolver:
  config:
    search:
      - redhat.com
      - usersys.redhat.com
    server:
      - 10.68.5.26
      - 2400:3200:baba::1
routes:
  config:
    - destination: 0.0.0.0/0
      next-hop-address: 100.1.1.254
      next-hop-interface: dummy0
      table-id: 100
    - destination: ::/0
      next-hop-address: 100::254
      next-hop-interface: dummy0
      table-id: 100
route-rules:
  config:
    - ip-from: 8.8.8.8/24
      ip-to: 200.1.1.1/24
      priority: 3000
      route-table: 100
    - ip-to: 111::/64
      priority: 4000
      route-table: 100
interfaces:
  - name: dummy0
    type: dummy
    state: up
    ipv4:
      enabled: true
      address:
        - ip: 100.1.1.1
          prefix-length: 24
    ipv6:
      enabled: true
      address:
        - ip: 100::1
          prefix-length: 64" | nmstatectl apply

nmstatectl show dummy0

Actual results:
---
dns-resolver: {}
route-rules: {}
routes: {}
interfaces:
  - name: dummy0
    type: dummy
    state: up
......

Expected results:


Additional info: