2967: disable DocumentationPluginsBootstrapper if spring-integration-plugin is present #2995
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What's this PR do/fix?
Fixes #2967
Are there unit tests? If not how should this be manually tested?
Test with https://github.com/springfox/springfox-demos
Any background context you want to provide?
Not all users who have spring-integration on the classpath also use spring-integration-webflux or spring-integration-http. We now postpone bootstrapping only if the SpringIntegrationDocumentationPluginsBootstrapper is in fact on the classpath.
What are the relevant issues?
In order to access the request mappings of spring-integration, the documentation plugins bootstrapper must execute after the spring-integration RequestHandlerMapping beans have been initialized, which happens later than with the plain RequestHandlerMapping beans.