Revert "[maven-release-plugin] prepare release maven-support-6.2-sp1"

This reverts commit 62436c67f3744d7889ba14f246a6bc3190242a9b.
Revert "Prepare 6.2-sp1 release."

This reverts commit ca210a0f3faf2d9356cb2186db0419fedc3b91af.