D-Bus testing: avoid duplicate testSync methods, minor improvements

When running all tests I noticed that the test runner showed
the two testSync methods with their method and class name. Not sure
whether this was because of the missing docstring or the duplication
of the method name; renamed the methods and added a description to
the test instead of the test suite.

The TestSessionAPIsReal.testSync() had failed with a description
that pointed towards the syncevo-dbus-server getting killed prematurely.
In an attempt to track this down I added a check of self.quit_events,
but then the test succeeded.

test/test-dbus.py

@@ -620,8 +620,10 @@ class TestSessionAPIsReal(unittest.TestCase, DBusUtil):
         self.setUpListeners(self.sessionpath)
         self.session.Sync("", {})
         loop.run()
+        self.failUnlessEqual(self.quit_events, ["session " + self.sessionpath + " done"])
 
     def testSync(self):
+        '''run a real sync with default server'''
         self.doSync()
         # TODO: check recorded events in self.events
         status, error, sources = self.session.GetStatus(utf8_strings=True)
@@ -650,8 +652,6 @@ class TestSessionAPIsReal(unittest.TestCase, DBusUtil):
         self.failUnlessEqual(reports, [])
 
 class TestDBusSyncError(unittest.TestCase, DBusUtil):
-    """Executes a real sync with no corresponding config."""
-
     def setUp(self):
         DBusUtil.__init__(self)
         self.setUpServer()
@@ -660,7 +660,8 @@ class TestDBusSyncError(unittest.TestCase, DBusUtil):
     def run(self, result):
         self.runTest(result, own_xdg=True)
 
-    def testSync(self):
+    def testSyncNoConfig(self):
+        """Executes a real sync with no corresponding config."""
         self.setUpListeners(self.sessionpath)
         self.session.Sync("", {})
         loop.run()