CentOS 7: install `which'
CentOS 7: install `which'

wporter82/packer-templates,d-adler/packer-templates,ody/packer-templates,ody/packer-templates,sachalin/packer_centos,sachalin/packer_centos,matsumana/packer-templates-2,wporter82/packer-templates,d-adler/packer-templates,reallyenglish/packer-templates,reallyenglish/packer-templates,kaorimatz/packer-templates,Pluto1010/packer-templates-1,matsumana/packer-templates-2,Pluto1010/packer-templates-1,kaorimatz/packer-templates