misc naming

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>
fix: data race in test

https://build.protocol-dev.com/job/race/9352/console

@jbenet @whyrusleeping

pinging you guys to spread awareness about the delay.D type for
configurable delays

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>