Cleanups - gofmt & removing unused items

  * Use a consistent gofmt setting on all files, correcting mix of tabs on `logstash-forwarder` / `config` and spaces everywhere else
  * Remove files only used during LSF's very early prototyping phase
  * `go vet` to remove unreachable code and fix a broken `Errorf`

Fixes issues I found confusing when originally trying to contribute to this project.