1. Update the UdpIo to a combined UdpIo to support both v4 and v6 stack.
2. Update Dhcp4 and Mtftp4 driver to adopt the combined UdpIo. 3. Clean up coding style problems in combined IpIoLib/NetLib. Update Tcp4 and Udp4 to adopt the changes. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9382 6f19259b-4bc3-4df7-8a09-765794883524
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