Module fails to load when collectd is built against python 2.6

[mschenck]

The string formatting syntax is only supported by python 2.7 and newer releases. When you try to load collectd-aurora with collectd built against python 2.6 collectd fails out of the configure_callback method with the following:

Starting collectd: Unhandled python exception in loading module: ValueError: zero length field name in format

commenting out the call to log_message() allows collectd-aurora to load, but then fails to submit any metrics (when verbose set to true) on the dispatch_stat() call to log_message(). commenting this out does allow the plugin to function, but you lose all of the logging.

[mschenck]

Pull Request 8 modifies the string formatting syntax to include support for python 2.6