Linux package consistency tweaks

Much like the deb-package-consistency branch, which this one depends on, make the RPMs consistent with foundationdb-server.

The only new files changed in this are build_packages.sh, redhat/fdb-sql-layer.init and redhat/fdb-sql-layer.spec.in.

The RPM build flow is now more like the deb, with everything being built and readied outside and placed into a location ready to be packaged. This should facilitate moving packaging output into target/ next.