Use default network type during PortTestCasesResourceRequest setup

A vxlan network is created during the resource_setup for class
PortTestCasesResourceRequest, failing when vxlan is not an available
driver
No restriction is needed in provider network type for these tests

Closes-Bug: #1879706

Change-Id: I164c4b7af7c0be00b8e70048e527b469587f0c8d
diff --git a/neutron_tempest_plugin/api/admin/test_ports.py b/neutron_tempest_plugin/api/admin/test_ports.py
index bdb66ef..9c94322 100644
--- a/neutron_tempest_plugin/api/admin/test_ports.py
+++ b/neutron_tempest_plugin/api/admin/test_ports.py
@@ -89,9 +89,7 @@
 
         cls.vnic_type = 'normal'
 
-        # Note(lajoskatona): to avoid creating provider network use vxlan
-        # as provider network type:
-        cls.network = cls.create_network(provider_network_type='vxlan')
+        cls.network = cls.create_network()
         cls.physnet_name = CONF.neutron_plugin_options.provider_vlans[0]
         base_segm = CONF.neutron_plugin_options.provider_net_base_segm_id
         cls.prov_network = cls.create_provider_network(