Update opencontainers/image-spec and fix gotest

[Sn0rt]

update opencontainers/image-spec to new version

govendor update +v github.com/opencontainers/image-spec

and update test

make test
go test -race -cover github.com/opencontainers/image-tools/cmd/oci-create-runtime-bundle github.com/opencontainers/image-tools/cmd/oci-image-validate github.com/opencontainers/image-tools/cmd/oci-unpack github.com/opencontainers/image-tools/image
?   	github.com/opencontainers/image-tools/cmd/oci-create-runtime-bundle	[no test files]
?   	github.com/opencontainers/image-tools/cmd/oci-image-validate	[no test files]
?   	github.com/opencontainers/image-tools/cmd/oci-unpack	[no test files]
ok  	github.com/opencontainers/image-tools/image	1.065s	coverage: 34.5% of statements

[wking]

On Thu, Nov 10, 2016 at 12:08:30AM -0800, Sn0rt wrote:

A vendor/github.com/opencontainers/image-spec/schema/config-schema.json (38)

Dup of #69?

[Sn0rt]

@wking you are right, embarrassed.