fix two bugs in fast-path caching in Identify2
fix two bugs in fast-path caching in Identify2

- we never cached ourself on the fast path
- we never reset the fast path after we hit the slow path

keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client