shell: apt: Don't block on changed config files
shell: apt: Don't block on changed config files

The selected logic prefers the existing conffiles, **unless** they are
exactly what was installed by the package, in which case the new
version of the conffile is prefered.

See https://raphaelhertzog.com/2010/09/21/debian-conffile-configuration-file-managed-by-dpkg/

hashbang/admin-tools,KellerFuchs/admin-tools,hashbang/admin-tools,KellerFuchs/admin-tools,singlerider/admin-tools