split distDokcer, build and tests in separate tasks

[csantanapr]

Today distDocker depends go build, and go build depends on go test

We should split them in seperate tasks, then in Travis run them in different steps.

Also to speed dev, and since tests don't run on OSX they will fail.

Compile/Build go code

./gradlew build

Run go tests

./gradlew tests

Build docker image

./gradlew distDocker