Change method for settin indexer; have test_livetest for pg cleanup

Add code to defer opening the indexer only if indexer is native-fts.
See if this fixes the sqlite OperationalError.

Also under python 2.7 (only), the db from test_livetracker when using
postgres FTS didn't empty the db. This caused the following
test_postgres.py test to fail.

Why it only showed up on 2.7 and not any of the 3.x releases is a
mystery.

Author: rouilj

roundup/backends/rdbms_common.py

@@ -188,7 +188,10 @@ def __init__(self, config, journaltag=None):
         # requires a database connection (conn) to be defined when
         # calling get_indexer.  The call to open_connection creates the
         # conn but also creates the schema if it is missing.
-        self.indexer = CommonIndexer(self)
+        if self.config['INDEXER'] != 'native-fts':
+            self.indexer = get_indexer(config, self)
+        else:
+            self.indexer = CommonIndexer(self)
         self.security = security.Security(self)
 
         # additional transaction support for external files and the like
@@ -217,7 +220,8 @@ def __init__(self, config, journaltag=None):
 
         # If indexer is native-fts, conn to db must be available.
         # so we set the real self.indexer value here, after db is open.
-        self.indexer = get_indexer(config, self)
+        if self.config['INDEXER'] == 'native-fts':
+            self.indexer = get_indexer(config, self)
 
     def clearCache(self):
         self.cache = {}

test/test_liveserver.py

@@ -1183,6 +1183,11 @@ def setup_class(cls):
         i18n.LOCALE_DIRS = ['locale']
         i18n.DOMAIN = ''
 
+    @classmethod
+    def tearDownClass(cls):
+        # cleanup
+        cls.instance.backend.db_nuke(cls.db.config)
+
     def test_native_fts(self):
         self.assertIn("postgresql_fts", str(self.db.indexer))