new kafka gem + consul discovery

[piavka]

This also solves the problem with inotify event overflow problem
it's not more will be firing events like crazy each time file is modified
instead it will wait for inotify events process them, and it not enough time has passed will sleep before processing next batch
thus it will be also more efficient as it will send bigger batches
also each batch will be sent to same partition instead of being randomly split among partitions resulting in smaller and less efficient batching