Adds globalize_slug(slug) to bottle_state alongside bottle_identity.
git_gate_provision now calls globalize_slug(slug) instead of inlining
socket.gethostname(), so the hostname-qualification logic has a single,
named home. Assumes slug is a mint_slug output.
Title format changes from bot-bottle:{host}:{slug}:{name}
to bot-bottle:{host}-{slug}:{name} to match the globalize_slug contract.
Closes#388 (part 1 of 3). Deploy key titles now carry the machine
hostname so keys provisioned on different hosts don't collide with
each other on the forge when a prior bottle was never torn down.
Title format: bot-bottle:<hostname>:<slug>:<repo-name>