Fix "main process kept alive forever by ToSServerThread."
Fix "main process kept alive forever by ToSServerThread."

jgillula/boulder,jgillula/boulder,josephyzhou/boulder,ZCloud-Firstserver/boulder,modulexcite/boulder,bmw/boulder,patf/boulder,lucasallan/boulder,devpaul/boulder,lucasallan/boulder,postfix/boulder,jmhodges/boulder,julienschmidt/boulder,KyleChamberlin/boulder,modulexcite/boulder,kuba/boulder,r0ro/boulder,kuba/boulder,r0ro/boulder,sophie-h/boulder,jmhodges/boulder,lmcro/boulder,mehmooda/boulder,jsha/boulder,letsencrypt/boulder,lucasallan/boulder,devpaul/boulder,jmhodges/boulder,deserted/boulder,deserted/boulder,devpaul/boulder,deserted/boulder,modulexcite/boulder,hlandauf/boulder,ibukanov/boulder,postfix/boulder,ZCloud-Firstserver/boulder,kuba/boulder,r0ro/boulder,KyleChamberlin/boulder,hlandauf/boulder,jsha/boulder,patf/boulder,jcjones/boulder,josephyzhou/boulder,kuba/boulder,mommel/boulder,hlandauf/boulder,jcjones/boulder,mozmark/boulder,mommel/boulder,lmcro/boulder,modulexcite/boulder,letsencrypt/boulder,postfix/boulder,KyleChamberlin/boulder,bmw/boulder,tomclegg/boulder,jcjones/boulder,jgillula/boulder,ZCloud-Firstserver/boulder,julienschmidt/boulder,bmw/boulder,benileo/boulder,sophie-h/boulder,mommel/boulder,jfrazelle/boulder,jgillula/boulder,ibukanov/boulder,mehmooda/boulder,jfrazelle/boulder,benileo/boulder,julienschmidt/boulder,ibukanov/boulder,tomclegg/boulder,mehmooda/boulder,r0ro/boulder,hlandauf/boulder,jsha/boulder,tomclegg/boulder,letsencrypt/boulder,mozmark/boulder,jcjones/boulder,devpaul/boulder,tomclegg/boulder,patf/boulder,mozmark/boulder,jfrazelle/boulder,mommel/boulder,julienschmidt/boulder,jfrazelle/boulder,jmhodges/boulder,ZCloud-Firstserver/boulder,mozmark/boulder,josephyzhou/boulder,postfix/boulder,KyleChamberlin/boulder,lmcro/boulder,sophie-h/boulder,mehmooda/boulder,lmcro/boulder,josephyzhou/boulder,deserted/boulder,benileo/boulder,patf/boulder,benileo/boulder