Removed references to `omaciel`.

Since we've moved the project to the `SatelliteQE` organization, I have
updated references to `omaciel/robottelo`.
Merge pull request #1434 from omaciel/update-index

Removed references to `omaciel`.
Port old API tests for repositories

Completely rewrite existing tests in module `test_repository_v2`. Make them more
terse, efficent and thorough. Drop module `test_repository`, as the "v2" module
now performs its responsibilities.