[Bug 2097159] [NEW] mk-sbuild fails when /etc/timezone doesn't exist

[Andy Li]

Public bug reported:

Looks like Debian unstable no longer contains /etc/timezone.
mk-sbuild would fail when it tries to copy /etc/timezone.

Tested with the debian:unstable docker image:

```
$ docker run --rm debian:unstable ls /etc/timezone
ls: cannot access '/etc/timezone': No such file or directory

```

** Affects: ubuntu-dev-tools (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  mk-sbuild fails when /etc/timezone doesn't exist

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