E2E tests should take a URL parameter

[lavocatt]

E2E test are assuming they'll connect on http://localhost:9000, it is a good default value, but they should as well accept load the URL from an environment variable CONSOLE_URL allowing to test on remote clusters if need be.

Items to do:

• Update the E2E test suite so that it takes into account the parameter
• Update the CI so that the parameter is used to define where is the console to test against