[ASF40]What release number should we choose?

[Edison Su]

Refer to bug https://issues.apache.org/jira/browse/CLOUDSTACK-44 and patch from 
https://reviews.apache.org/r/7013/, can we decide which release number for the 
rc1 and formal release? Something like: 4.0.0-rc1.{build number}, 4.0.0(for 
formal release)?