Merge pull request containers#810 from mtrmac/openshift-api-reference

Remove the reference to openshift/api

go.mod

@@ -15,7 +15,6 @@ require (
 	github.com/opencontainers/image-spec v1.0.2-0.20190823105129-775207bd45b6
 	github.com/opencontainers/image-tools v0.0.0-20170926011501-6d941547fa1d
 	github.com/opencontainers/runtime-spec v1.0.0 // indirect
-	github.com/openshift/api v3.9.1-0.20190810003144-27fb16909b15+incompatible // indirect
 	github.com/pkg/errors v0.9.1
 	github.com/russross/blackfriday v2.0.0+incompatible // indirect
 	github.com/sirupsen/logrus v1.4.2