SCC Migration feature UI

Test suite for https://trello.com/c/Kvfvy5HX
I think scenario descriptions have to high level. That line should say:

    Given the server is not migrated yet to SCC
    And SCC is already the default customer center

Otherwise you leak too much implementation details. Of course, in the step definitions, you can implement steps using other lower-level steps, like that one.

Usually high-level steps like that one should be part of the topic specific step definitions (eg. scc_steps). While other lower-level definitions that are reused across step definitions can be put in shared files.