support tag@digest notation

Vendor in the latest HEAd of containers/common to implicitly support the
tag@digest notation for images.  To remain compatible with Docker, the
tag will be stripped off the image reference and is entirely ignored.

Fixes: #6721
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

vendor/github.com/containers/common/pkg/config/nosystemd.go

@@ -3,9 +3,17 @@
 package config
 
 func defaultCgroupManager() string {
-	return "cgroupfs"
+	return CgroupfsCgroupsManager
 }
 
 func defaultEventsLogger() string {
 	return "file"
 }
+
+func defaultLogDriver() string {
+	return DefaultLogDriver
+}
+
+func useSystemd() bool {
+	return false
+}