Fixed 'sed' regex to remove public key by magic string.
Fixed 'sed' regex to remove public key by magic string.

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