{
  "_comment": "Build with `packer build -var-file=centos72.json centos.json`",
  "vm_name": "centos73",
  "cpus": "1",
  "disk_size": "65536",
  "iso_checksum": "c018577c75b2434fbb2c324789dee0ba887d9c32",
  "iso_checksum_type": "sha1",
  "iso_name": "CentOS-7-x86_64-DVD-1611.iso",
  "iso_url": "http://mirrors.sonic.net/centos/7.3.1611/isos/x86_64/CentOS-7-x86_64-DVD-1611.iso",
  "kickstart": "ks7.cfg",
  "memory": "512",
  "parallels_guest_os_type": "centos7"
}

{
  "_comment": "Build with `packer build -var-file=centos73.json centos.json`",
  "vm_name": "centos73",
  "cpus": "1",
  "disk_size": "65536",
  "iso_checksum": "c018577c75b2434fbb2c324789dee0ba887d9c32",
  "iso_checksum_type": "sha1",
  "iso_name": "CentOS-7-x86_64-DVD-1611.iso",
  "iso_url": "http://mirrors.sonic.net/centos/7.3.1611/isos/x86_64/CentOS-7-x86_64-DVD-1611.iso",
  "kickstart": "ks7.cfg",
  "memory": "512",
  "parallels_guest_os_type": "centos7"
}

Fix CentOS Server Version typo in the comment
Fix CentOS Server Version typo in the comment