rbd: use the correct length for format 2 object names

Format 2 objects use 16 characters for the object name suffix to be
able to express the full 64-bit range of object numbers. Format 1
images only use 12 characters for this. Using 12-character names for
format 2 caused userspace and kernel rbd clients to read differently
named objects, which made an image written by one client look empty to
the other client.

CC: [email protected]  # 3.9+
Reported-by: Chris Dunlop <[email protected]>
Signed-off-by: Josh Durgin <[email protected]>
Reviewed-by: Sage Weil <[email protected]>

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