Make GAE instance bind all interfaces when a variable is set.

tests/local_rietveld.py

Index: tests/local_rietveld.py
diff --git a/tests/local_rietveld.py b/tests/local_rietveld.py
index 49d1536f5865b12e7fab1cb3f73fa3d38d3c2393..d9727f1dd8131c1a68b84f6bf590ca6e879e84a6 100755
--- a/tests/local_rietveld.py
+++ b/tests/local_rietveld.py
@@ -96,6 +96,14 @@ class LocalRietveld(object):
         '--port=%d' % self.port,
         '--datastore_path=' + os.path.join(self.rietveld, 'tmp.db'),
         '-c']
+
+    # CHEAP TRICK
+    # By default you only want to bind on loopback but I'm testing over a
+    # headless computer so it's useful to be able to access the test instance
+    # remotely.
+    if os.environ.get('GAE_LISTEN_ALL', '') == 'true':
+      cmd.extend(('-a', '0.0.0.0'))
+
     self.test_server = subprocess2.Popen(
         cmd, stdout=pipe, stderr=pipe, cwd=self.rietveld)
     # Loop until port 127.0.0.1:port opens or the process dies.