x/ref: Refactor services/binary packages.

cmd/binary                     -> services/binary/binary
services/mgmt/binary/binaryd   -> services/binary/binaryd
services/mgmt/binary/impl      -> services/binary/binarylib
services/mgmt/binary/multipart -> services/binary/internal/multipart

In the future, we may be able to reduce the size of binarylib,
or even move it under internal somewhere.  But that'll be much
easier after we've refactored moved packages under
services/mgmt/* - before that's done, there are too many moving
pieces.

Change-Id: I2aa684c57d074f2977934445c043118763f72d16
25 files changed