JIRA: https://jira.spring.io/browse/INT-3539
Previously the `ChannelSecurityInterceptorBeanPostProcessor` eagerly loaded all beans from its `afterPropertiesSet`
to retrieve the `ChannelSecurityInterceptor`s. According to the `BeanPostProcessor` nature the `afterPropertiesSet` hook isn't legitimate.
It may cause some bad side-effects for other beans, which might not been initialized yet.
Rework `ChannelSecurityInterceptorBeanPostProcessor` to accept `Collection<ChannelSecurityInterceptor>` in the ctor.
Rework `SecurityIntegrationConfigurationInitializer` to iterate over `BeanDefinition`s to determine those of them, which
are `ChannelSecurityInterceptor` or `ChannelSecurityInterceptorFactoryBean`.
**Cherry-pick to 4.0.x**
542fc4fb5e