Jenkinsfile: Debug the env setup.

Jenkinsfile

@@ -7,6 +7,7 @@ node {
      }
      docker.image('golang:1.8').inside {
          stage "test"
+         sh 'env'
          sh "curl https://glide.sh/get | sh"
          sh "mv $GOPATH/src/github.com/UNINETT $GOPATH/src/github.com/uninett"
          sh "cd $GOPATH/src/github.com/uninett/jwt-tokenissuer"