ktest updates for v6.9:

- Allow variables to contain variables. This makes the shell commands
  have a bit more flexibility to reuse existing variables.

- Have make_warnings_file in build-only mode require limited variables

  The make_warnings_file test will create a file with all existing
  warnings (which can be used to compare against in builds with
  new commits). Add it to the build-only list that doesn't require
  other variables (like how to reset a machine), as the make_warnings_file
  makes the most sense on build only tests.

Ricardo B. Marliere (1):
      ktest: force $buildonly = 1 for 'make_warnings_file' test type

Steven Rostedt (1):
      ktest.pl: Process variables within variables

----
 tools/testing/ktest/ktest.pl | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)