Fix sidekiq config test
In SidekiConfig there are some code under Gitlab.jh?, tests run in upstream repo, it pass. However in JH repo, Gitlab.jh? return true will run that code which breaks test. So I stub Gitlab.jh? to false in upstream test, and will add related test in JH repo.
Changelog: other
cc: @daveliu
Edited by MAO Chao