sassist-0.8.7-bp156.4.3.1

- Update to 0.8.7
  * sos and supportconfig fixes.
  * documentation updates.
  * update the revision in _service file

- BuildRequire pkgconfig(systemd) instead of systemd: allow OBS to
  shortcut through systemd-mini.

- initial packaging based on spec file by Dell in the repository on
  https://github.com/dell/sassist/blob/master/pkg/sassist.spec