Allow I/O requests using metadata and DIF if base bdev supports them. Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com> Change-Id: Ie1b4b301a3d72d3fbd6e459ee2ab7d1a85425162 Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/460394 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Reviewed-by: Changpeng Liu <changpeng.liu@intel.com> Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>