go.net/publicsuffix: when generating table.go, track how much slack we
have in the bit-packing.

This was previously printed to stderr by gen.go, but is now written to
the generated table.go, so that we have better records of how it
changes over time.

LGTM=dr.volker.dobler
R=dr.volker.dobler
CC=golang-codereviews
https://golang.org/cl/89090043
2 files changed