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

This reverts commit 6465ceabb6084ca504e0bc40612be0c3ed4c53d4.
Revert "[maven-release-plugin] prepare release activemq-5.10.1"

This reverts commit d460402be36e163974b8addf14b9da2ebfb1d4c3.