Make Shippable timing script more resilient.

This will permit the script to pass through content which could
not be previously decoded or encoded. This could occur when running
some tests on macOS using file paths with non-ASCII characters.

test/utils/shippable/timing.py

@@ -1,10 +1,13 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python3.7
 
 import sys
 import time
 
 start = time.time()
 
+sys.stdin.reconfigure(errors='surrogateescape')
+sys.stdout.reconfigure(errors='surrogateescape')
+
 for line in sys.stdin:
     seconds = time.time() - start
     sys.stdout.write('%02d:%02d %s' % (seconds // 60, seconds % 60, line))