This splits out the single daemon into four different daemons (for
makechallenge, testchallenge, and issue, and for logging), switches
all but the logging daemon to no longer use pubsub (but instead
use brpop, which is a blocking queue pop), and tracks the number of
times that a given session has been tested (limited to 3).
There are also new scripts to try to start and stop all the daemons
with a single command.
