remove instruction to bring interfaces up
Add tab stop comment to make emacs act same as Ravi in vim
Kill unnecessary includes
Add tab comment to packet.hh
Simplify ferry.cc (eliminate packet.hh)
Simplify tapdevice, use RAII for FileDescriptor
Can't copy a filedescriptor
Catch the exception
Catch POLLERR on a file descriptor
Factor out FerryQueue into its own class