Migrate print to python3 format.

Bug: 1003186
Change-Id: I2337b00a1d82155a62ddd640128a2c3a61341922
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-py/+/1853745
Commit-Queue: Marc-Antoine Ruel <maruel@chromium.org>
Auto-Submit: Marc-Antoine Ruel <maruel@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Cr-Mirrored-From: https://chromium.googlesource.com/infra/luci/luci-py
Cr-Mirrored-Commit: 4cbfa30084848ecb1872096313cbcbb3c6a47784
diff --git a/utils/logging_utils.py b/utils/logging_utils.py
index 8001b01..de60563 100644
--- a/utils/logging_utils.py
+++ b/utils/logging_utils.py
@@ -4,6 +4,8 @@
 
 """Utility relating to logging."""
 
+from __future__ import print_function
+
 import argparse
 import codecs
 import ctypes
@@ -186,7 +188,7 @@
   logger = root or logging.getLogger()
   if not logger:
     # Better print insanity than crash.
-    print >> sys.stderr, 'OMG NO ROOT'
+    print('OMG NO ROOT', file=sys.stderr)
     return
   logger.setLevel(logging.DEBUG)
 
@@ -219,7 +221,7 @@
   handler = find_stderr(root)
   if not handler:
     # Better print insanity than crash.
-    print >> sys.stderr, 'OMG NO STDERR'
+    print('OMG NO STDERR', file=sys.stderr)
     return
   handler.setLevel(level)