DEFAULT: allow SHA-1 and DSA in sequoia (https://pagure.io/fesco/issue/2960)
Enables SHA-1 and DSA in DEFAULT policy.
#45 (closed), https://bugzilla.redhat.com/show_bug.cgi?id=2170878, https://pagure.io/fesco/issue/2960
@nwalfield, please review whether I've understood the request correctly.