Consolidate Resque-related initializers

Administratorrequested to merge
github/fork/rspeicher/resque_init into master

Created by: rspeicher

See https://github.com/gitlabhq/gitlabhq/pull/1496#issuecomment-8779662

@randx This may be worth tagging a 2.9.1 release and updating stable, so that the documented feature actually works.

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