Re-vendor, notably opencontainers/image-spec to fix tests#468

Merged

runcom merged 1 commit intocontainers:masterfrom mtrmac:oci-schema-rebase

Feb 9, 2018

+14,353-1,522

Commits on Feb 9, 2018

Re-vendor, and use mtrmac/image-spec:id-based-loader to fix tests
mtrmac
committed