Fix dhcpd IPython test

Author: gpotter2

test/scapy/layers/dhcp.uts

@@ -125,5 +125,5 @@ assert DHCPRevOptions['static-routes'][0] == 33
 
 assert dhcpd
 import IPython
-assert IPython.lib.pretty.pretty(dhcpd) == '<function scapy.ansmachine.dhcpd(self, pool=Net("192.168.1.128/25"), network=\'192.168.1.0/24\', gw=\'192.168.1.1\', nameserver=None, domain=None, renewal_time=60, lease_time=1800, **kwargs)>'
+assert IPython.lib.pretty.pretty(dhcpd) == '<function scapy.ansmachine.dhcpd(self, pool: Union[scapy.base_classes.Net, List[str]] = Net("192.168.1.128/25"), network: str = \'192.168.1.0/24\', gw: str = \'192.168.1.1\', nameserver: Union[str, List[str]] = None, domain: Optional[str] = None, renewal_time: int = 60, lease_time: int = 1800, **kwargs)>'