Removed dpkg config file overwrite prompts
Removed dpkg config file overwrite prompts

Unless told otherwise, dpkg will prompt the user when a package would overwrite
an customized configuration file. Made dpkg keep any modified configuration
files intact to get rid of the prompt which caused occasional cron-apt errors.

Signed-off-by: Samuli Seppänen <be49b59234361de284476e9a2215fb6477f46673@openvpn.net>

Puppet-Finland/updater