add longer pytest timeout for test_kea_config_valid (#14)

Signed-off-by: Alex Ball <aball@nvidia.com>

Author: polarweasel

src/tests/dhcp/test_kea_dhcp_confgen.py

@@ -181,6 +181,7 @@ async def test_subnet_id_preservation():
     assert 2 in subnet_ids.values()
 
 
+@pytest.mark.timeout(120)
 @pytest.mark.asyncio
 async def test_kea_config_valid():
     """Validate that KEA accepts our generated configuration."""