fix variable casing convention
fix variable casing convention

tb3088/packer,mkuzmin/packer,rnaveiras/packer,youhong316/packer,paulmey/packer,rnaveiras/packer,tb3088/packer,bryson/packer,tb3088/packer,paulmey/packer,ricardclau/packer,youhong316/packer,tas50/packer,paulmey/packer,hashicorp/packer,pecigonzalo/packer,mkuzmin/packer,ricardclau/packer,tas50/packer,youhong316/packer,dave2/packer,mkuzmin/packer,rnaveiras/packer,youhong316/packer,bryson/packer,timsutton/packer,tb3088/packer,paulmey/packer,tas50/packer,timsutton/packer,grubernaut/packer,rnaveiras/packer,mkuzmin/packer,hashicorp/packer,mitchellh/packer,bryson/packer,bryson/packer,grubernaut/packer,tas50/packer,tas50/packer,dave2/packer,rnaveiras/packer,dave2/packer,pecigonzalo/packer,ricardclau/packer,tas50/packer,mitchellh/packer,dave2/packer,timsutton/packer,pecigonzalo/packer,mkuzmin/packer,timsutton/packer,paulmey/packer,hashicorp/packer,ricardclau/packer,timsutton/packer,mkuzmin/packer,timsutton/packer,ricardclau/packer,paulmey/packer,youhong316/packer,mitchellh/packer,dave2/packer,mitchellh/packer,bryson/packer,dave2/packer,hashicorp/packer,youhong316/packer,grubernaut/packer,grubernaut/packer,pecigonzalo/packer,tb3088/packer,mitchellh/packer,tb3088/packer,grubernaut/packer,bryson/packer,ricardclau/packer,rnaveiras/packer,grubernaut/packer