Log and collect stats for events consistently

Just happened to notice that the scheduler did a statsd call about
events with the gerrit name. That's not accurate anymore.

Pull that code into the connection so that we can use the driver name
and the connection name in the statsd calls and in the log message
emitted.

Change-Id: Ia5ed9458c0b28573392c576db7789b61f4d87f3b
5 files changed