Network dut (#18668)

* Use dedicated account for testing

This also avoids any instance of "vyos" being masked by no_log

* use vyos-dut-01

test/integration/group_vars/vyos.yaml

@@ -1,6 +1,6 @@
 ---
 cli:
   host: "{{ ansible_ssh_host }}"
-  username: vyos
-  password: vyos
+  username: "{{ vyos_cli_user | default('ansible-admin') }}"
+  password: "{{ vyos_cli_pass | default('adminpw') }}"
   transport: cli