distro/redhat: Update to support CentOS/RHEL/Fedora, upstart/init/systemd

* redhat/quagga.spec.in: Update to support CentOS, RHEL and Fedora, and
  support the various init systems across different versions of these
  distros, e.g.  upstart/init/systemd.

  Clean up various warnings from rpmlint.

  Remove configure options that are gone.

A few edits and commit message by:
Paul Jakma <paul.jakma@hpe.com> / <paul@jakma.org>
3 files changed