Add checking point to determine whether the interface ipAddress contains

digit. To prevent the unexpected case when the interface can't retrieve
ip address from external vlan which cause test case
`test_vlan_to_mgmt_connection` failed.

harvester_e2e_tests/integration/test_networks.py

@@ -567,7 +567,11 @@ def test_mgmt_to_vlan_connection(self, api_client, request, client, unique_name,
                 interfaces_data = data['status']['interfaces']
                 ip_addresses = []
                 for interface in interfaces_data:
-                    if 'ipAddress' in interface:
+                    # Check the ipAddress in digital format
+                    if (
+                        'ipAddress' in interface and
+                        interface['ipAddress'].replace('.', '').isdigit()
+                    ):
                         ip_addresses.append(interface['ipAddress'])
 
                 if len(ip_addresses) > 0: