upmap: add regex to remove inf from osd dump before parsing to JSON

[JoshuaGabriel]

read balancer throwing 'inf' in osd dump, this line parses all inf into the string form

#46

[Avatat]

I can confirm that the issue appeared on clusters that were freshly updated from Pacific to Reef.

However, I fixed it in a slightly different, easier way:

osd_dump_json = output.decode('utf-8').strip().replace(":inf", ":Infinity")

Still, Infinity is not a valid JSON property, but it is accepted by Python's json lib and jq for example. Maybe we should change it in the Ceph/rados library?

[JoshuaGabriel]

@Avatat I think this fix is on its way, already in 18.2.5 https://tracker.ceph.com/issues/66215