travis: bump Packer version to 0.9.0
travis: bump Packer version to 0.9.0

wporter82/packer-templates,wporter82/packer-templates,reallyenglish/packer-templates,kaorimatz/packer-templates,kaorimatz/packer-templates,sachalin/packer_centos,sachalin/packer_centos,reallyenglish/packer-templates