1. Enable config cache to improve config service performance, just set
config-service.cache.enabled to true in ServerConfig
2. Normalize the namespace name in case the one provided has character
case issue

add comment why PropertySourcesProcessor implements BeanFactoryPostProcessor instead of BeanDefinitionRegistryPostProcessor

1. add log output to console for config and admin service
2. remove dev, lpt, tooling logic
3. add default 2 seconds of initial delay to long polling

1. make ApolloAnnotationProcessor run as late as possible
2. make PropertySourcesProcessor run as early as possible
3. fix PropertySourcesProcessor initialization logic to support multple
Spring contexts