network fixture: empty_network: move to 'function' scope

no need to have it to 'module' scope. creation is cheap and it permits better reusability of the fixture.

Signed-off-by: Sebastien Rodot <sebastien.rodot@vates.tech>

Author: semarie

tests/network/conftest.py

@@ -50,7 +50,7 @@ def vm_with_tcpdump_scope_function(vm_with_tcpdump_scope_module: VM):
     yield vm
     vm.destroy()
 
-@pytest.fixture(scope='module')
+@pytest.fixture(scope='function')
 def empty_network(host: Host) -> Generator[Network, None, None]:
     net = host.create_network(label="empty_network for tests")
     yield net