Merge branch 'jk/async-pkt-line'

The debugging infrastructure for pkt-line based communication has
been improved to mark the side-band communication specifically.

* jk/async-pkt-line:
  pkt-line: show packets in async processes as "sideband"
  run-command: provide in_async query function

diff --cc run-command.c
Simple merge

diff --cc run-command.h
Simple merge