Restore bytewise DNS check.
Restore bytewise DNS check.

patf/boulder,mehmooda/boulder,benileo/boulder,jfrazelle/boulder,ZCloud-Firstserver/boulder,r0ro/boulder,lucasallan/boulder,jsha/boulder,jfrazelle/boulder,mehmooda/boulder,ibukanov/boulder,jsha/boulder,patf/boulder,letsencrypt/boulder,letsencrypt/boulder,r0ro/boulder,benileo/boulder,r0ro/boulder,patf/boulder,r0ro/boulder,jfrazelle/boulder,benileo/boulder,letsencrypt/boulder,jcjones/boulder,jcjones/boulder,lucasallan/boulder,sophie-h/boulder,hlandauf/boulder,jsha/boulder,sophie-h/boulder,jcjones/boulder,bmw/boulder,ibukanov/boulder,ZCloud-Firstserver/boulder,hlandauf/boulder,bmw/boulder,hlandauf/boulder,ibukanov/boulder,mehmooda/boulder,bmw/boulder,sophie-h/boulder,benileo/boulder,mehmooda/boulder,ZCloud-Firstserver/boulder,jcjones/boulder,jfrazelle/boulder,hlandauf/boulder,patf/boulder,ZCloud-Firstserver/boulder,lucasallan/boulder