system df: fix image-size calculations

Fix two bugs in `system df`:

1.  The total size was calculated incorrectly as it was creating the sum
    of all image sizes but did not consider that a) the same image may
    be listed more than once (i.e., for each repo-tag pair), and that
    b) images share layers.

    The total size is now calculated directly in `libimage` by taking
    multi-layer use into account.

2.  The reclaimable size was calculated incorrectly.  This number
    indicates which data we can actually remove which means the total
    size minus what containers use (i.e., the "unique" size of the image
    in use by containers).

NOTE: The c/storage version is pinned back to the previous commit as it
      is buggy.  c/common already requires the buggy version, so use a
      `replace` to force/pin.

Fixes: #16135
Signed-off-by: Valentin Rothberg <vrothberg@redhat.com>

vendor/github.com/containers/common/libnetwork/network/interface.go

@@ -6,7 +6,6 @@ package network
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -37,11 +36,12 @@ const (
 // NetworkBackend returns the network backend name and interface
 // It returns either the CNI or netavark backend depending on what is set in the config.
 // If the the backend is set to "" we will automatically assign the backend on the following conditions:
-//   1. read ${graphroot}/defaultNetworkBackend
-//   2. find netavark binary (if not installed use CNI)
-//   3. check containers, images and CNI networks and if there are some we have an existing install and should continue to use CNI
+//  1. read ${graphroot}/defaultNetworkBackend
+//  2. find netavark binary (if not installed use CNI)
+//  3. check containers, images and CNI networks and if there are some we have an existing install and should continue to use CNI
 //
 // revive does not like the name because the package is already called network
+//
 //nolint:revive
 func NetworkBackend(store storage.Store, conf *config.Config, syslog bool) (types.NetworkBackend, types.ContainerNetwork, error) {
 	backend := types.NetworkBackend(conf.Network.NetworkBackend)
@@ -100,7 +100,7 @@ func NetworkBackend(store storage.Store, conf *config.Config, syslog bool) (type
 func defaultNetworkBackend(store storage.Store, conf *config.Config) (backend types.NetworkBackend, err error) {
 	// read defaultNetworkBackend file
 	file := filepath.Join(store.GraphRoot(), defaultNetworkBackendFileName)
-	b, err := ioutil.ReadFile(file)
+	b, err := os.ReadFile(file)
 	if err == nil {
 		val := string(b)
 		if val == string(types.Netavark) {