support ipxe scripts over data uris in ipxe script urls

Signed-off-by: Marques Johansson <mjohansson@equinix.com>

go.mod

@@ -13,7 +13,6 @@ require (
 	github.com/golang/protobuf v1.4.3 // indirect
 	github.com/google/go-cmp v0.5.2
 	github.com/google/uuid v1.1.5
-	github.com/kevinburke/go-bindata v3.22.0+incompatible
 	github.com/packethost/cacher v0.0.0-20200825140532-0b62e6726807
 	github.com/packethost/dhcp4-go v0.0.0-20190402165401-39c137f31ad3
 	github.com/packethost/pkg v0.0.0-20210325161133-868299771ae0
@@ -23,6 +22,7 @@ require (
 	github.com/stretchr/testify v1.6.1
 	github.com/tinkerbell/tftp-go v0.0.0-20200825172122-d9200358b6cd
 	github.com/tinkerbell/tink v0.0.0-20201109122352-0e8e57332303
+	github.com/vincent-petithory/dataurl v0.0.0-20191104211930-d1553a71de50
 	go.uber.org/zap v1.16.0
 	golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a
 	golang.org/x/lint v0.0.0-20200302205851-738671d3881b // indirect