Promote the installworld `certctl rehash` to distributeworld

Contrary to my belief, installworld is not sufficient for getting certs
installed into VM images. Promote the rehash to both installworld and
distributeworld (notably: not stageworld) and rehash the base distdir so we
end up with /etc/ssl/certs populated in the base dist archive. A future
commit will remove the rehash from bsdinstall, which doesn't really need to
happen if they're installed into base.txz.

While here, fix a minor typo: s/CERTCLTFLAGS/CERTCTLFLAGS/

MFC after:	1 week

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