Reuse ACMEv1 accounts for ACMEv2 in production (#6134)

* Reuse accounts made with ACMEv1 when using an ACMEv2 Let's Encrypt server. This commit turns the feature on for the production server; the bulk of the work was done in 8e4303a.

* add upgrade test for production server

certbot/constants.py

@@ -161,6 +161,7 @@ ACCOUNTS_DIR = "accounts"
 """Directory where all accounts are saved."""
 
 LE_REUSE_SERVERS = {
+    'acme-v02.api.letsencrypt.org/directory': 'acme-v01.api.letsencrypt.org/directory',
     'acme-staging-v02.api.letsencrypt.org/directory':
         'acme-staging.api.letsencrypt.org/directory'
 }

certbot/tests/account_test.py

@@ -218,12 +218,18 @@ class AccountFileStorageTest(test_util.ConfigTestCase):
         self._set_server('https://acme-staging.api.letsencrypt.org/directory')
         self.assertEqual([], self.storage.find_all())
 
-    def test_upgrade_version(self):
+    def test_upgrade_version_staging(self):
         self._set_server('https://acme-staging.api.letsencrypt.org/directory')
         self.storage.save(self.acc, self.mock_client)
         self._set_server('https://acme-staging-v02.api.letsencrypt.org/directory')
         self.assertEqual([self.acc], self.storage.find_all())
 
+    def test_upgrade_version_production(self):
+        self._set_server('https://acme-v01.api.letsencrypt.org/directory')
+        self.storage.save(self.acc, self.mock_client)
+        self._set_server('https://acme-v02.api.letsencrypt.org/directory')
+        self.assertEqual([self.acc], self.storage.find_all())
+
     @mock.patch('os.rmdir')
     def test_corrupted_account(self, mock_rmdir):
         # pylint: disable=protected-access