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

This reverts commit a30a69887e2be9d7ae27539bb8d80ae90548109c.
Revert "[maven-release-plugin] prepare release v0.8.0-incubating"

This reverts commit 8edc000a8dafb517b3d00fd581082f4d92c4ec28.
[maven-release-plugin] prepare release v0.8.0-incubating
[maven-release-plugin] prepare for next development iteration