There is no good reason to bloat the keyring by importing tons of
signatures we cannot use; drop any signatures that don't validate
against another available key (probably the master keys).
If any desired signatures get cleaned, the key can be refreshed after
importing the new signing public key.
Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Allan McRae <allan@archlinux.org>
2a792ac7bb