Fix DNS RTT stat to .A
Fix DNS RTT stat to .A

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