Created configuration helper

Finished changes from #500. I left switch statement in helper in this branch, but I also tried how it will look like, if switch statement would be in view partial - result: [branch](https://github.com/romanblanco/manageiq/compare/erb2haml3_opt2) | [diff](https://github.com/romanblanco/manageiq/commit/dd67abc6be96571d556a52b389f18e6314b3e1f2)
@bmclaughlin I have changed method that generate icon with link ([link_to_with_icon()](https://github.com/romanblanco/manageiq/commit/f8297ba6d5db5e6a02026d58aecd7a8750fb23ae#diff-4d8e193b8b9f7ec1f8041ee2e68dbfceL2442)). It should work correctly