AnsaIPv4: removed unnecessary overrides

Some method contained exactly the same body as in the base class.
They were introduced because the 'rt' field of IPv4 class was shadowed
by the 'rt' field of AnsaIPv4 class.

Removed 'AnsaIPv4::rt' and the unneeded overrides. Furthermore, AnsaIPv4::initialize()
calls IPv4::initialize(). (Original code executed a copy of IPv4::initialize() 5 times.)
IPv4MulticastRoute: removed getOutInterfaces() method
AnsaIPv4::routeMulticastPacket(): eliminate destIE parameter

It was always NULL.
increased simtime limit of some fingerprint tests
AnsaIPv4: use the datagram in notifications instead of an IPv4ControlInfo
to help transition to NetFilter hooks.

Furthermore, eliminated the '(IPv4ControlInfo*)(datagram->removeControlInfo()'
unsafe cast from handlePacketFromNetwork(). Network packets has a control info
attached by the link layer, and it is never an IPv4ControlInfo. (It is an
instance of Ieee802Ctrl for an Ethernet link.)