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
1 file changed