fix test that flaked in a travis build recently
fix test that flaked in a travis build recently

hashicorp/packer,youhong316/packer,ChrisLundquist/packer,KohlsTechnology/packer,KohlsTechnology/packer,tb3088/packer,ricardclau/packer,tas50/packer,smaato/packer,ricardclau/packer,dave2/packer,tas50/packer,sean-/packer,c22/packer,markpeek/packer,smaato/packer,paulmey/packer,sean-/packer,sean-/packer,arizvisa/packer,bryson/packer,bryson/packer,p1-nico/packer,rnaveiras/packer,ChrisLundquist/packer,pieter-lazzaro/packer,markpeek/packer,pvandervelde/packer,paulmey/packer,pieter-lazzaro/packer,atlassian/packer,mkuzmin/packer,sean-/packer,grubernaut/packer,atlassian/packer,pvandervelde/packer,bryson/packer,jen20/packer,paulmey/packer,pieter-lazzaro/packer,pieter-lazzaro/packer,mkuzmin/packer,dave2/packer,mitchellh/packer,mkuzmin/packer,youhong316/packer,ricardclau/packer,c22/packer,pvandervelde/packer,p1-nico/packer,KohlsTechnology/packer,arizvisa/packer,ricardclau/packer,paulmey/packer,tas50/packer,sean-/packer,dave2/packer,taliesins/packer,hashicorp/packer,pieter-lazzaro/packer,routelastresort/packer,dave2/packer,KohlsTechnology/packer,KohlsTechnology/packer,pvandervelde/packer,rnaveiras/packer,youhong316/packer,taliesins/packer,grubernaut/packer,jen20/packer,jen20/packer,ChrisLundquist/packer,grubernaut/packer,paulmey/packer,hashicorp/packer,tas50/packer,mitchellh/packer,p1-nico/packer,youhong316/packer,timsutton/packer,pecigonzalo/packer,rnaveiras/packer,tas50/packer,ChrisLundquist/packer,pvandervelde/packer,taliesins/packer,markpeek/packer,pecigonzalo/packer,sean-/packer,rnaveiras/packer,tb3088/packer,timsutton/packer,routelastresort/packer,grubernaut/packer,mitchellh/packer,c22/packer,mitchellh/packer,arizvisa/packer,tas50/packer,grubernaut/packer,c22/packer,ricardclau/packer,c22/packer,p1-nico/packer,youhong316/packer,smaato/packer,routelastresort/packer,markpeek/packer,bryson/packer,taliesins/packer,smaato/packer,mitchellh/packer,markpeek/packer,p1-nico/packer,ChrisLundquist/packer,mkuzmin/packer,rnaveiras/packer,bryson/packer,routelastresort/packer,p1-nico/packer,arizvisa/packer,atlassian/packer,arizvisa/packer,paulmey/packer,pvandervelde/packer,taliesins/packer,c22/packer,timsutton/packer,dave2/packer,timsutton/packer,rnaveiras/packer,grubernaut/packer,pecigonzalo/packer,mkuzmin/packer,ChrisLundquist/packer,dave2/packer,mkuzmin/packer,bryson/packer,atlassian/packer,KohlsTechnology/packer,smaato/packer,tb3088/packer,markpeek/packer,tb3088/packer,smaato/packer,timsutton/packer,jen20/packer,routelastresort/packer,pieter-lazzaro/packer,taliesins/packer,timsutton/packer,hashicorp/packer,arizvisa/packer,atlassian/packer,atlassian/packer,jen20/packer,tb3088/packer,youhong316/packer,pecigonzalo/packer,tb3088/packer,jen20/packer,ricardclau/packer