Make adding a failing test a regression

When there is no test in testing, and a failing test in unstable, don't
allow the package to migrate. Doing so would make it instantly RC-buggy.

Signed-off-by: Ivo De Decker <ivodd@debian.org>

britney2/policies/autopkgtest.py

@@ -1080,7 +1080,7 @@ class AutopkgtestPolicy(BasePolicy):
                         self.request_test_if_not_queued(src, arch, REF_TRIG)
                         result = 'RUNNING-REFERENCE'
                     else:
-                        result = 'ALWAYSFAIL'
+                        result = 'REGRESSION'
                 else:
                     result = 'REGRESSION'
             else: