Fix bash issue
Fix bash issue

When hitting CTRL+C while dapper is running would result in bash
taking up 100%

rancherio/cattle,cjellick/cattle,wlan0/cattle,cjellick/cattle,rancherio/cattle,cloudnautique/cattle,vincent99/cattle,cjellick/cattle,cloudnautique/cattle,rancherio/cattle,rancher/cattle,Cerfoglg/cattle,jimengliu/cattle,jimengliu/cattle,Cerfoglg/cattle,wlan0/cattle,jimengliu/cattle,cloudnautique/cattle,vincent99/cattle,cloudnautique/cattle,rancher/cattle,vincent99/cattle,cjellick/cattle,Cerfoglg/cattle,rancher/cattle,wlan0/cattle