Strip DD/DM/DN keyrings to only include verifiable signatures

Run "scripts/clean-keydir clean" against the DD/DM/DN keyrings,
leaving only signatures that come from other keys within these
keyrings. Notable decrease in keyring sizes:

debian-keyring-gpg		 50M ->  27M
debian-maintainers-gpg		7.0M -> 3.1M
debian-nonupload-gpg		468k -> 248k
parent f4bb7c51
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