Add a /b option to show tcpcb and show all tcpcbs to print BBLog entries. Right now this supports the entries generated by the FreeBSD default TCP stack. It should help in debugging issues reported by syzkaller, for example panic: tcp_do_segment: sent too much: NUM>NUM.
The syntax for printing sent and received packets is similar to the one used by packetdrill, since the output of ddb will be used to create packetdrill scripts for debugging.