vendor of containers/(common, storage, image)

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

vendor/github.com/containers/storage/store.go

@@ -142,6 +142,7 @@ type Store interface {
 	// settings that were passed to GetStore() when the object was created.
 	RunRoot() string
 	GraphRoot() string
+	ImageStore() string
 	TransientStore() bool
 	GraphDriverName() string
 	GraphOptions() []string
@@ -862,6 +863,10 @@ func (s *store) GraphRoot() string {
 	return s.graphRoot
 }
 
+func (s *store) ImageStore() string {
+	return s.imageStoreDir
+}
+
 func (s *store) TransientStore() bool {
 	return s.transientStore
 }