x/ref: Move packages without external users into internal.
The general strategy is to put each package in as narrow a scope
as possible; i.e. as deep in the package hierarchy as possible,
under an internal directory to hide them from godoc.
lib/unixfd -> services/agent/internal/unixfd
lib/suid -> services/device/internal/suid
lib/sysinit -> services/device/internal/sysinit
services/binary/binarylib -> services/internal/binarylib
services/binary/internal/multipart -> services/internal/multipart
services/logreader/logreaderlib -> services/internal/logreaderlib
services/pprof/pproflib -> services/internal/pproflib
services/stats/statslib -> services/internal/statslib
services/vtrace/vtracelib -> services/internal/vtracelib
Note that "multipart" had to be moved up in the hierarchy, since
it's used by binarylib.
Change-Id: Ia0dc67bb72a6e8e60ad0b3a3df31e7612931f54e
64 files changed
