Ceph

In StupidAllocator::_choose_bin, it uses cct->_conf->bdev_block_size that can be changed in the allocator running,but we had free space enxtens in 10 free trees with the old bdev_block_size, so the _choose_bin will give a wrong bin that is as the index of 10 free trees for the user has changed the bdev_block_size through osd asok config set command.