Moved RPM build to 'release-sign-artifacts' role.
Moved RPM build to 'release-sign-artifacts' role.

xuzhongxing/deeplearning4j,xuzhongxing/deeplearning4j,crockpotveggies/deeplearning4j,xuzhongxing/deeplearning4j,xuzhongxing/deeplearning4j,crockpotveggies/deeplearning4j,xuzhongxing/deeplearning4j,xuzhongxing/deeplearning4j,crockpotveggies/deeplearning4j,crockpotveggies/deeplearning4j,crockpotveggies/deeplearning4j,crockpotveggies/deeplearning4j