Followup on Go dependency Jenga

I was finally able to build a working version of the glide.yaml file for my project and convert it to dep. The items of note:

• To get openzipkin to work, I needed to specify

  [[constraint]]
    branch = "master"
    name = "github.com/opentracing/opentracing-go"
  
  [[override]]
    name = "github.com/openzipkin/zipkin-go-opentracing"
  
  

• To get logrus to work, I had to change it to github.com/sirupsen/logrus in all my code and specify

  [[constraint]]
    name = "github.com/sirupsen/logrus"
    version = "^1.0.5"