fix test_global_settings.py integration tests

Author: bernardodemarco

test/integration/smoke/test_global_settings.py

@@ -79,7 +79,7 @@ def tearDown(self):
 
         updateConfigurationCmd = updateConfiguration.updateConfigurationCmd()
         updateConfigurationCmd.name = "commands.timeout"
-        updateConfigurationCmd.value = ""
+        updateConfigurationCmd.value = " "
         self.apiClient.updateConfiguration(updateConfigurationCmd)
 
 class TestListConfigurations(cloudstackTestCase):