Plumb the version from the ringbuilder through to the metadata at the
start of the ring. Recover this (if available) when running
swift-ring-builder <ring> write_builder
When we load the ring, track the count and MD5 of the bytes off disk, as
well as the number of uncompressed bytes.
Expose all this new information as properties on the Ring, along with
- device_count (number of non-None entries in self._devs),
- weighted_device_count (number of devices that have weight), and
- assigned_device_count (number of devices that actually have
partition assignments).
Co-Authored-By: Matthew Oliver <matt@oliver.net.au>
Change-Id: I73deaf6f1d9c1d37630c37c02c597b8812592351
6853616aea