Revert "[maven-release-plugin] prepare for next development iteration"

This reverts commit 3462ccb2b4eec81533d00c0435dfc42eb23a3b04.
Revert "[maven-release-plugin] prepare release axis2-1.6.1-wso2v11-rc1"

This reverts commit c47977055c85ebf61a4ca87627249b841cad632c.