fix #2014, autowire OneOffJobBootstrap failed. #2307
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Fixes
#2014
Changes proposed in this pull request:
cause of issue:
the bean which is registered in method afterSingletonsInstantiated can't be autowired, because autowire is earlier than afterSingletonsInstantiated which is executed by AutowiredAnnotationBeanPostProcessor.
solution:
OneOffBootStrap need to be registered before autowire phase, and AutowiredAnnotationBeanPostProcessor is a MergedBeanDefinitionPostProcessor bean, so ElasticJobBootstrapConfiguration need to be a MergedBeanDefinitionPostProcessor bean too, and OneOffBootStrap should be registered after ElasticJobBootstrapConfiguration initialized immediately.