Part of the Go project layout migration, item 31.
Pure move plus import-path rewrite across 687 files. No API or behaviour
change.
The services keep their grouping under pkg/services/<name> rather than
being promoted to pkg/<name>: 27 top-level directories in pkg/ would read
worse than what we have, and the grouping is what makes "an RPC service"
identifiable at a glance.
Paths that follow the move: the logosstorage test target and generate
step, the two wallet token-list tools, the migration-order check (and the
pre-rebase hook symlinked to it), and the storage env helper.
refs #7067
Igor Sirotin
f9cc782a6f