Add --loop pass-through option to call QA::Specs::LoopRunner
Adds --loop option to pass arguments to QA::Specs::LoopRunner, which will call upon RSpec::Core::Runner in a time-limited loop. See https://gitlab.com/gitlab-org/gitlab/merge_requests/18546
Related to https://gitlab.com/gitlab-org/quality/testcases/issues/194
Edited by James Nutt