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210d9dd026
applier_fiber could create multiple snapshots between io_fiber run. The fsm_output.snp variable was overwritten by applier_fiber and io_fiber didn't drop the previous snapshot. In this patch we introduce the variable fsm_output.snps_to_drop, store in it the current snapshot id before applying a new one, and then sequentially drop them in io_fiber after storing the last snapshot_descriptor. _sm_events.signal() is added to fsm::apply_snapshot, since this method mutates the _output and thus gives a reason to run io_fiber. The new test test_frequent_snapshotting demonstrates the problem by causing frequent snapshots and setting the applier queue size to one. Closes #11530