cloud/shepherd/equinix/wrapngo: init

This adds a wrapper extending packngo for use with the upcoming
Shepherd implementation.

Supersedes: https://review.monogon.dev/c/monogon/+/989
Change-Id: I55d1a609a8b5241704c5fe4ce8c2294122cfa0c8
Reviewed-on: https://review.monogon.dev/c/monogon/+/1128
Reviewed-by: Leopold Schabel <leo@monogon.tech>
Tested-by: Jenkins CI
Reviewed-by: Mateusz Zalega <mateusz@monogon.tech>
diff --git a/go.mod b/go.mod
index 4c48b0e..03d0f33 100644
--- a/go.mod
+++ b/go.mod
@@ -101,6 +101,7 @@
 	github.com/mdlayher/netlink v1.6.0
 	github.com/mdlayher/raw v0.1.0
 	github.com/opencontainers/runc v1.1.3
+	github.com/packethost/packngo v0.29.0
 	github.com/pierrec/lz4/v4 v4.1.14
 	github.com/pkg/errors v0.9.1
 	github.com/rekby/gpt v0.0.0-20200614112001-7da10aec5566