Write Nemesis that causes bloom filter reload

[mykaul]

Currently, we have a new functionality in Scylla that if BF is above a certain threshold, it will be re-created. This never gets exercised in SCT. The idea is to write a workload Nemesis that would cause that to happen.

@bhalevy - I'm assigning to you, but I assume it'll be a cooperation with the QA team.

[bhalevy]

@denesb please work with QA Automation on that.

[denesb]

With our current way of estimating partition count of output sstables for compaction, any workload which is delete or overwrite heavy, and thus can result in big partition-count reduction when compacting sstables -- either because duplicate writes or because of tombstones paired with data they shadow -- will be good way to stress this new functionality.

[bhalevy]

Cc @pehala