[Proxy] ARP tests

Change-Id: I40d6d763b55a26cdee0afef85d1acdd19dd10dd6
Signed-off-by: Neale Ranns <nranns@cisco.com>

test/util.py

@@ -47,6 +47,11 @@ def ip4n_range(ip4n, s, e):
             for ip in ip4_range(ip4, s, e))
 
 
+def mactobinary(mac):
+    """ Convert the : separated format into binary packet data for the API """
+    return mac.replace(':', '').decode('hex')
+
+
 class NumericConstant(object):
     __metaclass__ = ABCMeta