Fix non-interactive mode
Fix non-interactive mode

When 'non-interactive' is not specified gitlab-ci-multi-runner will ask for the all parameters anyway. 

As a workaround REGISTER_NON_INTERACTIVE env-var can be used.
sameersbn/docker-gitlab-ci-multi-runner,munnerz/docker-gitlab-ci-multi-runner,oomathias/docker-gitlab-ci-multi-runner