Feature/clean urls

[tbarbugli]

Summary:

Change how urls are constructed for API, Collections and Personalization.

Regular API endpoints:

https://${api_location}-api.stream-io-api.com/api/v1.0/
https://api.stream-io-api.com/api/v1.0/

Personalization API endpoints:

https://${api_location}-personalization.stream-io-api.com/personalization/v1.0/
https://personalization.stream-io-api.com/personalization/v1.0/

Collections API endpoint:

https://${api_location}-api.stream-io-api.com/api/v1.0/meta/
https://api.stream-io-api.com/api/v1.0/meta/

This PR should also keep supporting QA test runs, local test runs (LOCAL=1), Heroku URLs and the use of arbitrary urls provided via base_url.

Submitter checklist:

• [ ] CHANGELOG updated or N/A
• [ ] Documentation updated or N/A

Merger checklist:

• [ ] ALL tests have passed
• [ ] Code Review is done
• [ ] Dependencies satisfied

Dependencies:

• [ ]

[tschellenbach]

With this approach we also need to verify that the domains are used correctly:

• do the personalization endpoints actually point to the personalization server (to me it seems they don't)
• when we use custom locations we should still include the region. ie uacf is a terrible name. uacf-us-east would be much better.

[tbarbugli]

@tschellenbach both uacf-personalization.stream-io-api.com and personalization.stream-io-api.com point to the ELB if that does not work let me and Alessandro know.

[BalazsHoranyi]

Did not mean to push that last change, apologies. Next push should put it back to where it was before.