Currently the logging for polling is verbose. Adjust it as follows:
* In the git driver, don't list every ref we see, just log the count
so we know it's working.
* In the gerrit driver, move logging of some HTTP traffic to the
* In the default logging configuration for the server, if the '-d'
option is given, do not include "io" logging. The only way to
get this extremely verbose data is now with a custom logging