v1.10

enable parallel blob reads
lockfile: implement reader-writer locks
avoid `defer x.Unlock()` pattern in loops
Make use of overlay.override_kernel_check a warning instead of an error
images: always set Digest if we have digests
Teach images to hold multiple manifests
image-by-digest.bats: print output
Vendor github.com/containers/image
Don't ignore errors reloading layer/image/container lists
Move structs for storage.conf to pkg/config