Extending OpenCrowbar RPM package builds to enable versioning

Thiese changes permit the building of OpenCrowbar RPM package release builds, while still allowing the build script to be use in Jenkins continuous build processing.

The ephemeral RPMs build will be identified by a version string consisting of:
VERSION.Short_GIT_sha

If VERSION=2.1.0 and the Short_GIT_sha=abc009, the build version will be: 2.1.0.abc009