CLI should gracefully shut down (clear js-ipfs lock)

When ceramic-cli gets shut down, the js-ipfs repo lock isn't properly released. Users have to wait at least 10 seconds for that lock to get released before spinning the daemon back up. It would be great if ceramic-CLI could gracefully shut down to avoid this, which would pave the way for other graceful shutdown actions that might be useful for future use cases

Start at the ceramic-cli shutdown path and reproduce the daemon restart while the js-ipfs repository lock is still held. Trace how shutdown currently handles the process and verify that the lock is released before the daemon can be started again.

Written by the indexing model from the issue text.