Update to latest, rework to use dracut
    
    * Update to the latest 1.9.0.alpha2 release
    * Use the new upstream dracut support for building the initrd.
    * Add fedora-kata-osbuilder.sh which handles the actual initrd/image
      build invocations, repopulating /usr/share/kata-containers. Stuff
      this script in /usr/libexec/kata-containers so it's easier to
      manually trigger while this stuff is in flux. The upstream suggested
      way to do this is to use their Makefile, but that implicitly
      expects generating images at package build time, and we are currently
      generating images at RPM install time, using the host kernel
    * Stuff the kata-agent into this package, built it and drop the
      relevant bits we need into
      /usr/libexec/kata-containers/osbuilder/agent . This may want to be
      its own package some day
    * Misc tweaks and cleanups
    
    Signed-off-by: Cole Robinson <crobinso@redhat.com>