[maven-release-plugin] prepare branch release-0.4.0-incubating
[maven-release-plugin] prepare branch release-0.4.0-incubating

sijie/bookkeeper,apache/bookkeeper,sijie/bookkeeper,sijie/bookkeeper,sijie/bookkeeper,apache/bookkeeper,ivankelly/bookkeeper,sijie/bookkeeper,apache/bookkeeper,ivankelly/bookkeeper,sijie/bookkeeper,apache/bookkeeper,apache/bookkeeper,apache/bookkeeper,ivankelly/bookkeeper,sijie/bookkeeper,sijie/bookkeeper