We need a better automation of the release process.

At the moment, the release process is driven by the wiki page https://cwiki.apache.org/confluence/display/BIGTOP/How+to+release
The info is very helpful, but it needs to be updated and also requires a number of manual steps.

Let's have a one-command release process that will include all needed steps like iTest, test artifacts uploads. as well as site creation and release artifacts deployment.