cmd/swarm/swarm-smoke: improve smoke tests (#1337) swarm/network: remove dead code (#1339) swarm/network: remove FetchStore and SyncChunkStore in favor of NetStore (#1342)
* swarm/network, swarm/storage: validate default chunk size * swarm/bmt, swarm/network, swarm/storage: update BMT hash initialisation * swarm/bmt: move segmentCount to tests * swarm/chunk: change chunk.DefaultSize to be untyped const * swarm/storage: add size validator * swarm/storage: add chunk size validation to localstore * swarm/storage: move validation from localstore to validator * swarm/storage: global chunk rules in MRU
