pkg/oci is a general utility package with dependency chains that are
uneccessary for the shim.
The shim only actually used it for a convenience function for reading
an oci spec file.
Instead of pulling in those deps just re-implement that internally in
the shim command.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Allow the api to stay at the same v1 go package name and keep using a
1.x version number. This indicates the API is still at 1.x and allows
sharing proto types with containerd 1.6 and 1.7 releases.
Signed-off-by: Derek McGowan <derek@mcg.dev>
