Revert "osd: give recovery ops initialized by client op a higher priority"

Revert "osd: give recovery ops initialized by client op a higher priority"

This reverts commit c0f87e0f91539d4d12dad5bddf95a97457a21c67.

The 'osd_op_queue_cut_off' config option determines which level of
high priority ops should use strict priority ordering and may change
from time to time. Since the main strategy of 'osd_kick_recovery_op_priority'
is to simply follow up 'osd_op_queue_cut_off', we can instead make a direct
use of 'osd_op_queue_cut_off' to achieve the same thing explicitly.

Signed-off-by: xie xingguo <xie.xingguo@zte.com.cn>