Fix v6 source (remote) and dest (local) address
Fix v6 source (remote) and dest (local) address

For v6, tcpdrop.py would report the source and destination addresses incorrectly - tcp_drop() covers the input path, where the source of the received packet is the daddr stored in the socket, while the destination of the received packet is the local address.   This commit swaps them to be correct and leaves a comment since it is not obvious.
brendangregg/bcc,iovisor/bcc,brendangregg/bcc,iovisor/bcc,brendangregg/bcc,iovisor/bcc,iovisor/bcc,brendangregg/bcc,brendangregg/bcc,iovisor/bcc