Switch to Go Modules and cleanup Dockerfile #6
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Recently Go switched to using Go modules for their dependency management. This updates the project to make use of those.
It also introduces the builder pattern for the Docker files to keep a minimal image. It first builds the load test Go binary and Vegeta (dependency) and later copies that into the image that actually runs the test. This way we have a clean image and it also runs a more suitable OS, instead of the OS required for building Go binaries.