add a way to override config file attributes from the test framework
diff --git a/xos/xos/config.py b/xos/xos/config.py
index e8b8dbc..83d69cb 100644
--- a/xos/xos/config.py
+++ b/xos/xos/config.py
@@ -25,6 +25,11 @@
 def str2bool(v):
 	return v.lower() in ("true", "1")
 
+# allow the test framework to apply global overrides to the config framework
+override = {}
+def set_override(name, value):
+    override[name] = value
+
 class Config:
 
 	def __init__(self, config_file=None):
@@ -251,6 +256,8 @@
 		self.write(filename)
 
 	def __getattr__(self, attr):
+                if attr in override:
+                    return override[attr]
 		return getattr(self.config, attr)
 
 if __name__ == '__main__':