test-bot: handle changed bottled dependencies.
Don't use keg, Cellar and bottle jargon.

This is unnecessarily confusing to end-users and the "fun" naming
doesn't really communicate anything.
grass: add 6.4.4_1 bottle.
gtk-engines: add 2.20.2 bottle.
noweb: add 2.11b bottle.
readline: update 6.3.8 bottle.