oeqa/core/context: expose results as variable

register an unittest handler for testresults and expose it as
variable result.
With this even partial results from an interrupted test suite run
can be made available

(From OE-Core rev: 07a3ea1aece5c67d75b60417ee0978cc0e15719a)

Signed-off-by: Konrad Weihmann <kweihmann@outlook.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit a97ae47525157871b6c098ffc352293e365a4335)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/core/context.py

@@ -31,6 +31,9 @@ class OETestContext(object):
         self._registry = {}
         self._registry['cases'] = collections.OrderedDict()
 
+        self.results = unittest.TestResult()
+        unittest.registerResult(self.results)
+
     def _read_modules_from_manifest(self, manifest):
         if not os.path.exists(manifest):
             raise OEQAMissingManifest("Manifest does not exist on %s" % manifest)