serve: add chdir command for --daemon-postexec For chgserver, it probably needs a chdir to /. This patch adds chdir command support for --daemon-postexec so chg client can make use of it.

serve: accept multiple values for --daemon-postexec The next patch will add another postexec command: chdir, which can be used together with unlink. This patch changes the option type of --daemon-postexec from string to list to accept multiple commands. The error message of invalid --daemon-postexec value is also changed to include the actual invalid value.