The one provided by appc/spec creates the manifest file with uid=0 and gid=0,
this break tests launched as non root user, because pkg/tar cannot to lchown
the manifest.
Take two at getting the spec vendored into Rocket with Godep.
Since actool is used during the construction of the stage1.aci, it
really needs to be vendored too to prevent any unexpected divergence
between whatever version the user happens to have in their PATH. Thus,
we introduce a silly dummy package (stage1/dummy.go) to coerce Godep
into vendoring actool. This also requires a slight rearrangement of the
appc repo, moving some functionality from actool itself into the aci
package.
Jonathan Boulle