Comment out custom py27 tox environment.

grpcio 0.13.0 is broken on UCS2 Python 2.7.

Author: tseaver

tox.ini

@@ -21,14 +21,17 @@ covercmd =
       --cover-branches \
       --nocapture
 
-[testenv:py27]
-basepython =
-    python2.7
-deps =
-    {[testenv]deps}
-    grpcio >= 0.13.0
-setenv =
-    PYTHONPATH =
+# Until grpcio 0.13.1 ships, this environment is broken on UCS2 builds.
+# See: https://github.com/grpc/grpc/issues/5280 and
+#      https://github.com/grpc/grpc/pull/5319
+#[testenv:py27]
+#basepython =
+#    python2.7
+#deps =
+#    {[testenv]deps}
+#    grpcio >= 0.13.0
+#setenv =
+#    PYTHONPATH =
 
 [testenv:cover]
 basepython =