Update condense_policy.py for python3

Specify that python3 should be used in the script.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I7bc419ca75cb98ff455d1f0c59cb0d3b38c74696
diff --git a/condense_policy.py b/condense_policy.py
index 565ad09..4614781 100755
--- a/condense_policy.py
+++ b/condense_policy.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 '''Condenses the error policy table down to only the fields used by
    the BMC Code.