Follow-up from "Bug fixes and improvements for VDF daemon"

The following discussion from !6084 (merged) should be addressed:

• @andrea.cerone started a discussion: (+9 comments)

  Does this also take case of avoiding setting the vdf computation status as Not_started when a reorganization occurs that causes the cycle number seen by the vdf daemon to decrease (e.g. the reorganization occurs around the level of a new cycle)?