Detect compression in ApplyDiff()
Detect compression in ApplyDiff()

When we detect a compressed diff tarball in ApplyDiff, make a note of it
as a layer flag.  If we don't detect compression, clear any such flag.

Signed-off-by: Nalin Dahyabhai <f562fcb2a0b898bf0be1afc867ea92325d8f825f@redhat.com>

containers/storage,containers/storage,containers/storage,rhatdan/storage,rhatdan/storage,rhatdan/storage