x/ref: Restructure services/mgmt/lib

The renamings:

services/mgmt/lib/binary/impl.go      -> services/binary/binarylib/client.go
services/mgmt/lib/binary/impl_test.go -> services/binary/binarylib/client_test.go

services/mgmt/lib/acls     -> services/internal/acls
services/mgmt/lib/fs       -> services/internal/fs
services/mgmt/lib/packages -> services/internal/packages
services/mgmt/lib/testutil -> services/internal/servicetest

Change-Id: Icabfbcc4e9a20fd5bf5e2a2761f98a016560d409
38 files changed