packaging: setup: editConfigContent: compare strings

Make editConfigContent compare values as strings when deciding if
value was changed.

Without this change, an excessive comment line will be added to
/var/lib/pgsql/data/postgresql.conf after comparing int(150) and
str(150).

Change-Id: Ia747d05416ff0ed1fbd74f0d4cce2c9f6b621755
Signed-off-by: Yedidyah Bar David <didi@redhat.com>