Bootstrap.sh requires url to listen on port 3000, it shouldn't

[a-nldisr]

We have deployed the dashboard in our DCOS cluster using the provided docker containers as a test to see how tyk works, we had a few issues deploying. One of these issues was that port 3000 had a requirement while we expose our dashboards only through only http or https. After removing the port requirement the bootstrap started working.

Using a specific port should be an option, not a requirement.