Merge pull request #3307 from theotherjimmy/import-sys-in-config

Add sys import to config

Author: 0xc0170

tools/config.py

@@ -17,6 +17,7 @@
 
 from copy import deepcopy
 import os
+import sys
 # Implementation of mbed configuration mechanism
 from tools.utils import json_file_to_dict
 from tools.targets import CUMULATIVE_ATTRIBUTES, TARGET_MAP, \