revision: Don't mark as a rerun unless explicitly set

Whenever we are duplicating metadata about a revision let's clean the
rerun state.

Without this all revisions to series that had been rerun were stuck in
the "this is a rerun" state, even if updated version of the patches were
sent.

Fixes #31Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>

patchwork/models.py

@@ -700,6 +700,7 @@ class SeriesRevision(models.Model):
         new.test_state = None
         new.skip_testing = False
         new.skip_requester = None
+        new.is_rerun = False
         new.save()
 
         return new

patchwork/tests/test_series.py

@@ -878,6 +878,18 @@ class SeriesRevisionTest(GeneratedSeriesTest):
         self.assertEqual(dup.raw_cover_letter_headers,
                           org.raw_cover_letter_headers)
 
+    def testDuplicateMetaShouldResetRerunState(self):
+        (test_series, mails) = self._create_series(1)
+        test_series.insert(mails)
+        series = Series.objects.all()[0]
+        org = series.revisions()[0]
+        org.is_rerun = True
+        org.save()
+
+        dup = org.duplicate_meta()
+
+        self.assertFalse(dup.is_rerun)
+
 
 #
 # series-new-revision event tests