linux-kselftest-4.20-rc1

This Kselftest update for Linux 4.20-rc1 consists of:

- Improvements to ftrace test suite from Masami Hiramatsu.
- Color coded ftrace PASS / FAIL results from Steven Rostedt (VMware)
  to improve readability of reports.
- watchdog Fixes and enhancement to add gettimeout and get|set pretimeout
  options from Jerry Hoemann.
- Several fixes to warnings and spelling etc.
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