Bug#410866: Upgrading destar rewrites /etc/asterisk/destar_cfg.py if it's already present.

[Alejandro Rios P.]

Package: destar
Version: 0.2.0-3
Severity: grave

The file /etc/asterisk/destar_cfg.py contains configuration information
modified by the user, rewriting it with an example will cause its data loss.

-- System Information:
Debian Release: 4.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-4-686
Locale: LANG=es_CO.UTF-8, LC_CTYPE=es_CO.UTF-8 (charmap=UTF-8)