This fixes a data race on worker.current by moving the call to StopPrefetcher
into the main loop.
The commit also contains fixes for two other races in unit tests of unrelated packages.
This removes the error log message that says
Ethereum peer removal failed ... err="peer not registered"
The error happened because removePeer was called multiple
times: once to disconnect the peer, and another time when the
handler exited. With this change, removePeer now has the sole
purpose of disconnecting the peer. Unregistering happens exactly
once, when the handler exits.
