Fix PRX_NODE_MEMORY variable name

Change-Id: I9c413853957bbab63852ebd307af51e769f849ce
diff --git a/tcp_tests/settings_oslo.py b/tcp_tests/settings_oslo.py
index bddaad4..1847a61 100644
--- a/tcp_tests/settings_oslo.py
+++ b/tcp_tests/settings_oslo.py
@@ -206,7 +206,7 @@
            default='{}/openstack-docker/remote_storage_adapter:latest'.format(
                settings.DOCKER_REGISTRY)),
     # SalesForce connection options for pushkin
-    ct.Cfg('sfdc_sandbox_enabled', ct.String(), default=False),
+    ct.Cfg('sfdc_sandbox_enabled', ct.String(), default='False'),
     ct.Cfg('sfdc_auth_url', ct.String(), default=''),
     ct.Cfg('sfdc_username', ct.String(), default=''),
     ct.Cfg('sfdc_password', ct.String(), default=''),