Vendor fork correctly

`vndr` has support for forks!

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

src/cmd/linuxkit/run_packet.go

@@ -16,7 +16,7 @@ import (
 	"path/filepath"
 	"time"
 
-	"github.com/rn/packngo"
+	"github.com/packethost/packngo"
 	log "github.com/sirupsen/logrus"
 	"golang.org/x/crypto/ssh"
 	"golang.org/x/crypto/ssh/agent"

src/cmd/linuxkit/vendor.conf

@@ -1,7 +1,6 @@
 github.com/Azure/azure-sdk-for-go 26132835cbefa2669a306b777f34b929b56aa0a2
 github.com/Azure/go-ansiterm 19f72df4d05d31cbe1c56bfc8045c96babff6c7e
 github.com/Azure/go-autorest 58f6f26e200fa5dfb40c9cd1c83f3e2c860d779d
-github.com/bzub/packngo 087cff23a860cd69a8c4818c8f6411bd47f6ab96
 github.com/Microsoft/go-winio f533f7a102197536779ea3a8cb881d639e21ec5a
 github.com/aws/aws-sdk-go fa107560b5f3528a859a1a1511086646731bb1a8
 github.com/dgrijalva/jwt-go 6c8dedd55f8a2e41f605de6d5d66e51ed1f299fc
@@ -13,10 +12,10 @@ github.com/gophercloud/gophercloud 2804b72cf099b41d2e25c8afcca786f9f962ddee
 github.com/jmespath/go-jmespath bd40a432e4c76585ef6b72d3fd96fb9b6dc7b68d
 github.com/mitchellh/go-ps 4fdf99ab29366514c69ccccddab5dc58b8d84062
 github.com/moby/hyperkit a82b409a87f12fa3306813410c37f4eed270efac
+github.com/packethost/packngo eacc1098296fb3d75607a13e2607474ce40f55b9 https://github.com/rn/packngo.git
 github.com/radu-matei/azure-sdk-for-go 3b12823551999669c9a325a32472508e0af7978e
 github.com/radu-matei/azure-vhd-utils e52754d5569d2a643a7775f72ff2a6cf524f4c25
 github.com/rn/iso9660wrap 4606f848a055435cdef85305960b0e1bb788d506
-github.com/rn/packngo eacc1098296fb3d75607a13e2607474ce40f55b9
 github.com/sirupsen/logrus 1.0.2
 github.com/vmware/govmomi 6f8ebd89d521d9f9af7a6c2219c4deee511020dd
 golang.org/x/crypto 573951cbe80bb6352881271bb276f48749eab6f4