rhel/centos spec cleanups.

Many changes here to get us able to build rpms on CentOS 5 or 6 and RHEL.

 * add 'Requires' as 'BuildRequires' also.
   This allows us to run cloud-init tools in the build environment, and
   also will allow us to run tests in the build process.
 * build for both systemd and upstart (centos 5) init systems.
 * Add 'centos' as a variant
   Adding the variant means we can use the 'centos' user as default on centos
   rather than a 'fedora' or 'rhel'.
 * drop argparse from the requirements.
   On any system other than python 2.6, having a 'requirements' that mentions
   argparse just causes problems.  Instead we add that Requires to the spec
   directly.
 * list dependency on dmidecode (as redhat distro spec had)
 * remove duplicate line in files section ({_unitdir}/cloud-*)
 * Use rpm macros for init-system chunks and drop use
   of init_system variable template
 * Add el6 only build-req on python-argparse
 * python-cheetah is not required in the build environment as the
   the spec is already rendered.  (We will soon move the spec to jinja).

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