Add IOError to the list of problems caught when attempting to write to
Graphite. Reason was because "IOError: Connection timed out" would percolate
out to the top level and exit logstash.
Moved from https://github.com/elasticsearch/logstash/pull/1299
Add IOError to the list of problems caught when attempting to write to Graphite. Reason was because "IOError: Connection timed out" would percolate out to the top level and exit logstash. Moved from https://github.com/elasticsearch/logstash/pull/1299