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

This reverts commit 8a754ae175712f35f25d2cb1d4cbeaa317f447b0.
Revert "[maven-release-plugin] prepare release broadleaf-3.1.0-GA"

This reverts commit c38c31facc2fae753ddc531f5fac2905865c9fe5.