Adding fixes for the rhos tasks

* verbosity test with ksgen
* fixing the foreman_plugins repo disabling to do it in the right place
* only try to disable openstack-version repo on the tempest node if
  it has a codenamed
* fix repo_type to use ksgen value
* fix answer_file to use ksgen style
* typos, clarifications in task names

Change-Id: Ief191ecc7f757a7d5e3a46d313449577edb0d3d4