Remove traceback from error messages on the console

[Olof Kindgren]

If I ssh into a computer and uses aptdcon to install a package, aptdaemon fails with

olof@ichiban:~$ aptdcon --install meld
Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/aptdaemon/defer.py", line 390, in _next
    self.result = callback(self.result, *args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/client.py", line 966, in on_error
    error_handler(error)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/errors.py", line 147, in <lambda>
    lambda err: error_handler(get_native_exception(err))
  File "/usr/lib/python2.6/dist-packages/aptdaemon/console.py", line 363, in _on_exception
    sys.exit(msg)
SystemExit: ERROR: You are not allowed to perform this action.

('system-bus-name', {'name': ':1.60'}): org.debian.apt.install-or-remove-packages

If this is a problem in aptdaemon, then it is a bug, and if this is because policykit isn't designed to work over remote connections, then this is a feature request that I would like to have a better error message

[Sebastian Heinlein (glatzor)]

There isn't any PolicyKit console client. So you need to run aptdcon using sudo over ssh. But indeed the message could be improved.