swarm/storage/mru: Renamed rest of MRU references

cmd/swarm/main.go

cmd/swarm/mru.go

cmd/swarm/mru_test.go

swarm/api/api.go

swarm/api/client/client.go

swarm/api/client/client_test.go

swarm/api/http/server.go

swarm/api/http/server_test.go

swarm/api/manifest.go

swarm/api/uri.go

swarm/network/README.md

swarm/storage/localstore_test.go

swarm/storage/mru/doc.go

swarm/storage/mru/error.go

swarm/storage/mru/handler.go

swarm/storage/mru/handler_test.go

swarm/storage/mru/request_test.go

swarm/swarm.go

swarm/testutil/http.go