builder/scaleway: support ssh agent authentication
builder/scaleway: support ssh agent authentication

pecigonzalo/packer,tas50/packer,routelastresort/packer,mkuzmin/packer,tb3088/packer,pecigonzalo/packer,p1-nico/packer,mitchellh/packer,ricardclau/packer,dave2/packer,mitchellh/packer,youhong316/packer,grubernaut/packer,ChrisLundquist/packer,rnaveiras/packer,bryson/packer,mkuzmin/packer,ChrisLundquist/packer,dave2/packer,dave2/packer,hashicorp/packer,routelastresort/packer,tas50/packer,mitchellh/packer,p1-nico/packer,rnaveiras/packer,pieter-lazzaro/packer,p1-nico/packer,routelastresort/packer,hashicorp/packer,paulmey/packer,tb3088/packer,pieter-lazzaro/packer,rnaveiras/packer,youhong316/packer,p1-nico/packer,pecigonzalo/packer,p1-nico/packer,ricardclau/packer,tas50/packer,grubernaut/packer,grubernaut/packer,timsutton/packer,ricardclau/packer,KohlsTechnology/packer,youhong316/packer,mkuzmin/packer,p1-nico/packer,timsutton/packer,grubernaut/packer,KohlsTechnology/packer,bryson/packer,youhong316/packer,KohlsTechnology/packer,tb3088/packer,KohlsTechnology/packer,pieter-lazzaro/packer,ricardclau/packer,grubernaut/packer,mkuzmin/packer,dave2/packer,ricardclau/packer,pieter-lazzaro/packer,paulmey/packer,timsutton/packer,hashicorp/packer,paulmey/packer,mkuzmin/packer,KohlsTechnology/packer,rnaveiras/packer,bryson/packer,tas50/packer,routelastresort/packer,routelastresort/packer,ChrisLundquist/packer,bryson/packer,pecigonzalo/packer,mitchellh/packer,youhong316/packer,rnaveiras/packer,paulmey/packer,paulmey/packer,dave2/packer,ChrisLundquist/packer,tb3088/packer,hashicorp/packer,ChrisLundquist/packer,ricardclau/packer,mkuzmin/packer,KohlsTechnology/packer,youhong316/packer,timsutton/packer,ChrisLundquist/packer,tas50/packer,grubernaut/packer,timsutton/packer,tb3088/packer,dave2/packer,tas50/packer,bryson/packer,mitchellh/packer,rnaveiras/packer,timsutton/packer,pieter-lazzaro/packer,paulmey/packer,bryson/packer,pieter-lazzaro/packer,tb3088/packer