Add more path redaction to distupgrade plugin

The preupgrade-assistant duplicates user home directory listings
in the file /root/preupgrade/kickstart/untrackeduser. Also apply
redactions to path names at this location.

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>
[distupgrade] fix missing ',' in doRegexSub() call

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>