Increase output_limit for the ceilometer_influxdb_accumulator

The default value for the output_limit parameter is 64K which is too
low for Ceilometer samples and causes the service to crash under
load.

Decrease batch size (flush_count) because in this case batch_size
can be greater than max_message_size (from global.toml).

Change-Id: I5149394cd6595377ee12604b6b9df04722d0af1f
1 file changed