Reduce zdb output when pool contains checkpoint

When running zdb without additional arguments against a pool containing
a checkpoint the entire checkpoint spacemap should not be dumped.  Make
this behavior conditional upon passing the -mmmm option as described in
the zdb(8) man page.

     -mmmm   Display every spacemap record.

Reviewed-by: Serapheim Dimitropoulos <[email protected]>
Reviewed-by: Giuseppe Di Natale <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #7702 

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