🏗 Use `xenial` VMs on Travis for faster bootup (#20987)
🏗 Use `xenial` VMs on Travis for faster bootup (#20987)


jmadler/amphtml,danielrozenberg/amphtml,mhc-gh/amphtml,smartadserver/amphtml,yandex-pcode/amphtml,src-code/amphtml,alanorozco/amphtml,adup-tech/amphtml,jpettitt/amphtml,yandex-pcode/amphtml,tlong2/amphtml,honeybadgerdontcare/amphtml,mhc-gh/amphtml,media-net/amphtml,erwinmombay/amphtml,yandex-pcode/amphtml,cvializ/amphtml,ampproject/amphtml,Gregable/amphtml,mhc-gh/amphtml,techhtml/amphtml,nexxtv/amphtml,zhangsu/amphtml,cory-work/amphtml,cory-work/amphtml,danielrozenberg/amphtml,prateekbh/amphtml,zhouyx/amphtml,techhtml/amphtml,honeybadgerdontcare/amphtml,ampproject/amphtml,sebastianbenz/amphtml,rsimha-amp/amphtml,taboola/amphtml,jridgewell/amphtml,voyagegroup/amphtml,zhouyx/amphtml,danielrozenberg/amphtml,jridgewell/amphtml,src-code/amphtml,cory-work/amphtml,nexxtv/amphtml,sharethrough/amphtml,zhangsu/amphtml,lannka/amphtml,media-net/amphtml,rsimha-amp/amphtml,media-net/amphtml,voyagegroup/amphtml,cvializ/amphtml,smartadserver/amphtml,erwinmombay/amphtml,Gregable/amphtml,danielrozenberg/amphtml,rsimha-amp/amphtml,zhangsu/amphtml,Gregable/amphtml,prateekbh/amphtml,voyagegroup/amphtml,cory-work/amphtml,sebastianbenz/amphtml,honeybadgerdontcare/amphtml,Gregable/amphtml,yandex-pcode/amphtml,tlong2/amphtml,danielrozenberg/amphtml,taboola/amphtml,adup-tech/amphtml,nexxtv/amphtml,jpettitt/amphtml,jpettitt/amphtml,smartadserver/amphtml,nexxtv/amphtml,danielrozenberg/amphtml,adup-tech/amphtml,lannka/amphtml,jridgewell/amphtml,cvializ/amphtml,jridgewell/amphtml,dotandads/amphtml,ampproject/amphtml,zhangsu/amphtml,lannka/amphtml,rsimha-amp/amphtml,ampproject/amphtml,erwinmombay/amphtml,dotandads/amphtml,jpettitt/amphtml,danielrozenberg/amphtml,tlong2/amphtml,cory-work/amphtml,jridgewell/amphtml,jridgewell/amphtml,jmadler/amphtml,techhtml/amphtml,sebastianbenz/amphtml,alanorozco/amphtml,dotandads/amphtml,yandex-pcode/amphtml,ampproject/amphtml,techhtml/amphtml,techhtml/amphtml,Gregable/amphtml,tlong2/amphtml,src-code/amphtml,sharethrough/amphtml,cvializ/amphtml,rsimha-amp/amphtml,honeybadgerdontcare/amphtml,jpettitt/amphtml,voyagegroup/amphtml,cory-work/amphtml,zhouyx/amphtml,taboola/amphtml,alanorozco/amphtml,jpettitt/amphtml,jridgewell/amphtml,zhangsu/amphtml,media-net/amphtml,voyagegroup/amphtml,erwinmombay/amphtml,rsimha-amp/amphtml,alanorozco/amphtml,dotandads/amphtml,voyagegroup/amphtml,Gregable/amphtml,jmadler/amphtml,zhangsu/amphtml,media-net/amphtml,adup-tech/amphtml,erwinmombay/amphtml,src-code/amphtml,prateekbh/amphtml,prateekbh/amphtml,sharethrough/amphtml,sharethrough/amphtml,nexxtv/amphtml,mhc-gh/amphtml,media-net/amphtml,ampproject/amphtml,danielrozenberg/amphtml,jmadler/amphtml,adup-tech/amphtml,taboola/amphtml,tlong2/amphtml,zhouyx/amphtml,media-net/amphtml,jmadler/amphtml,alanorozco/amphtml,Gregable/amphtml,honeybadgerdontcare/amphtml,dotandads/amphtml,mhc-gh/amphtml,prateekbh/amphtml,alanorozco/amphtml,taboola/amphtml,jpettitt/amphtml,smartadserver/amphtml,nexxtv/amphtml,jmadler/amphtml,media-net/amphtml,Gregable/amphtml,honeybadgerdontcare/amphtml,prateekbh/amphtml,honeybadgerdontcare/amphtml,cory-work/amphtml,zhouyx/amphtml,mhc-gh/amphtml,lannka/amphtml,sharethrough/amphtml,smartadserver/amphtml,alanorozco/amphtml,sebastianbenz/amphtml,cvializ/amphtml,sharethrough/amphtml,taboola/amphtml,lannka/amphtml,alanorozco/amphtml,dotandads/amphtml,ampproject/amphtml,smartadserver/amphtml,ampproject/amphtml,techhtml/amphtml,adup-tech/amphtml,zhouyx/amphtml,taboola/amphtml,mhc-gh/amphtml,sebastianbenz/amphtml,tlong2/amphtml,rsimha-amp/amphtml,cvializ/amphtml,voyagegroup/amphtml,lannka/amphtml,jpettitt/amphtml,yandex-pcode/amphtml,prateekbh/amphtml,src-code/amphtml,yandex-pcode/amphtml,erwinmombay/amphtml,src-code/amphtml,zhouyx/amphtml,lannka/amphtml,mhc-gh/amphtml,nexxtv/amphtml,sebastianbenz/amphtml