reanahub / reana-server / 749

55%

master: 53%

Pull #205

travis-ci

scheduler: requeue workflows when starting failure

* In the event of workflow start up errors (due to DB connections,
  failure connecting to Kubernetes etc...) REANA-Server's scheduler
  should requeue the workflow, otherwise it will be lost
  (closes reanahub/reana#253).

* Catches all exceptions on the `on_message` method, avoiding the
  scheduler container to stay alive even after errors
  (closes #204).

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