fix: don't treat empty data partition as other space in vitastor-disk…

[Flynn049]

Hi, @vitalif

I found vitastor-disk prepare is not reusing empty data partitions to create OSD as expected when the empty partition takes up very large or the entire disk space. Currently, a disk partition is considered to be of 'other data' if it does not contain any existing OSD's data. But an empty vitastor partition shouldn't be counted as 'other data' since it's reusable, right?

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[vitalif]

Hi, it's not reusing them on purpose: who knows what's left there :-) I want the user to explicitly delete the partition if he wants to reuse the space.

[Flynn049]

Hi, it's not reusing them on purpose: who knows what's left there :-) I want the user to explicitly delete the partition if he wants to reuse the space.

Even if it's an empty vitastor partition? But why collecting them in use_parts? And current code will actually reuse the partition anyway if it's the only partition on the device, having vitastor type, and consumes less than max_other_percent of the device.