convert -s snapshot.name=name1
Previous I planned to use -l for internal snapshot in all possible
program, since -s is taken as external snapshot in qemu, qemu-nbd.
let -s stands for internal in qemu-img convert only, may bring
confuse to user, so I deprecated it instead of enhance it(I want
to remove it but may bring compatiablity issue).
Yes, it should report error when both specified, will send a patch
if you agree '-l' should still be used.
Eric, I hope to get your idea before patching, any comments?
