This change adds the following libzfs_core functions to pyzfs: lzc_remap, lzc_pool_checkpoint, lzc_pool_checkpoint_discard Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: loli10K <ezomori.nozomu@gmail.com> Closes #7793 Closes #7800