[PATCH 3 of 3 V2] chg: pass sensitive command line flags to server

[timeless]

Jun Wu wrote:
> We are going to make chgserver load repo config, remember what it is, and
> load repo config again to detect config change. This is the first step that
> passes config, repo, cwd options to server. Traceback is passed as well to
> cover errors before hitting chgserver.runcommand.

Do you want to pass Debug as well?
(Debugger can't be easily)