blkzone: Fix zone condition strings handling

blkzone: Fix zone condition strings handling

Fixed the condition strings for implicit open and explicit open to
match the man page defined strings ("oi" and "oe"). Also while at it,
correct the condition_str array entries adding the reserved "xC" case
so that the read_only, full and offline conditions match the condition
codes. This increases the array size to 16, so also fix the condition
code masking when displaying the result.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>