builder/linode: remove unused sshConfig() function and associated import
builder/linode: remove unused sshConfig() function and associated import

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