unconditionally deregister adapters in tearDown

This also fixes test_unacceptable_charset which was
leaving an adapter registered

src/zope/publisher/tests/test_http.py

@@ -205,6 +205,11 @@ def __call__(self, a, b):
         self.app.folder.item = Item()
         self.app.xxx = Item()
 
+    def tearDown(self):
+        # unregister adapters registered in tests
+        from zope.component.testing import tearDown
+        tearDown()
+
     def _createRequest(self, extra_env={}, body=b""):
         env = self._testEnv.copy()
         env.update(extra_env)
@@ -442,9 +447,6 @@ def testRequestLocale(self):
         eq(locale.id.territory, None)
         eq(locale.id.variant, None)
 
-        from zope.component.testing import tearDown
-        tearDown()
-
     def testCookies(self):
         cookies = {
             'HTTP_COOKIE':