Add python3 support for tools

Test: ./system/timezone/update-tzdata.py
Test: ./system/timezone/download-iana-data.py
Change-Id: I10a1062149c0484a4345cc4c389df5dff6112985
diff --git a/tzdatautil.py b/tzdatautil.py
index 839a9f4..b7f81e3 100644
--- a/tzdatautil.py
+++ b/tzdatautil.py
@@ -12,6 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from __future__ import print_function
+
 import os
 import sys
 
@@ -28,6 +30,6 @@
   elif len(matching_files) == 1:
     return '%s/%s' % (dir_name, matching_files[0])
   else:
-    print 'Multiple tz%s files found unexpectedly %s' % (file_type, matching_files)
+    print('Multiple tz%s files found unexpectedly %s' % (file_type, matching_files))
     sys.exit(1)