packaging: setup: read legacy config with trivial parser

and not with configfile, because it was written without escaping special
chars.

Bug-Url: https://bugzilla.redhat.com/1079911
Change-Id: I563e8dcfa54e6d23c1e4828c422dcf88ffe1738e
Signed-off-by: Yedidyah Bar David <didi@redhat.com>