py3: update all the things

Change-Id: I5e11b46b7c2f7f8760d6c0e713ca99c1e88b7cd3
diff --git a/tools/post_process_props.py b/tools/post_process_props.py
index 6bb68c7..64af01d 100755
--- a/tools/post_process_props.py
+++ b/tools/post_process_props.py
@@ -14,7 +14,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os, sys
+import sys
 
 
 def iteritems(obj):
@@ -60,7 +60,7 @@
   # default to "adb". That might not the right policy there, but it's better
   # to be explicit.
   if not prop.get("persist.sys.usb.config"):
-    prop.put("persist.sys.usb.config", "none");
+    prop.put("persist.sys.usb.config", "none")
 
 def validate(prop):
   """Validate the properties.