Continue switching from libkpod to libpod

Refactored rmi, images, diff, and history.
Made fixes to kpod images in the way it was handing the templates as well as printing the image names

Signed-off-by: umohnani8 <umohnani@redhat.com>

libpod/runtime_ctr.go

@@ -1,6 +1,7 @@
 package libpod
 
 import (
+	"github.com/containers/storage"
 	spec "github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/pkg/errors"
 )
@@ -99,11 +100,11 @@ func (r *Runtime) LookupContainer(idOrName string) (*Container, error) {
 	return r.state.LookupContainer(idOrName)
 }
 
-// Containers retrieves all containers from the state
+// GetContainers retrieves all containers from the state
 // Filters can be provided which will determine what containers are included in
 // the output. Multiple filters are handled by ANDing their output, so only
 // containers matching all filters are returned
-func (r *Runtime) Containers(filters ...ContainerFilter) ([]*Container, error) {
+func (r *Runtime) GetContainers(filters ...ContainerFilter) ([]*Container, error) {
 	r.lock.RLock()
 	defer r.lock.RUnlock()
 
@@ -131,3 +132,29 @@ func (r *Runtime) Containers(filters ...ContainerFilter) ([]*Container, error) {
 
 	return ctrsFiltered, nil
 }
+
+// getContainersWithImage returns a list of containers referencing imageID
+func (r *Runtime) getContainersWithImage(imageID string) ([]storage.Container, error) {
+	var matchingContainers []storage.Container
+	containers, err := r.store.Containers()
+	if err != nil {
+		return nil, err
+	}
+
+	for _, ctr := range containers {
+		if ctr.ImageID == imageID {
+			matchingContainers = append(matchingContainers, ctr)
+		}
+	}
+	return matchingContainers, nil
+}
+
+// removeMultipleContainers deletes a list of containers from the store
+func (r *Runtime) removeMultipleContainers(containers []storage.Container) error {
+	for _, ctr := range containers {
+		if err := r.store.DeleteContainer(ctr.ID); err != nil {
+			return errors.Wrapf(err, "could not remove container %q", ctr)
+		}
+	}
+	return nil
+}