Start snapdir_iterate traversals to begin wtih the value of zero.

The microzap hash can sometimes be zero for single digit snapnames.
The zap cursor can then have a serialized value of two (for . and ..),
and skip the first entry in the avl tree for the .zfs/snapshot directory
listing, and therefore does not return all snapshots.

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Cedric Berger <[email protected]>
Signed-off-by: Tony Perkins <[email protected]>
Closes #11039

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