Change mvn groupId from io.brooklyn to org.apache.brooklyn

There are some references to io.brooklyn. Try searching the code-base for the regular expresion `maven.*io.brooklyn`. It includes things like `BrooklynNode` referencing `http://search.maven.org/remotecontent?filepath=io/brooklyn/brooklyn-dist/${version}/brooklyn-dist-${version}-dist.tar.gz` to get its install artefacts. In that case, we'd need to add something that checks the version number, or more likely say it can only install apache brooklyn official releases once those are available.