Merge pull request #358 from dklempner/build

test/core/end2end/gen_build_json.py

-#!/usr/bin/python
+#!/usr/bin/python2.7
 
 """Generates the appropriate build.json data for all the end2end tests."""
 

tools/buildgen/mako_renderer.py

-#!/usr/bin/python
+#!/usr/bin/python2.7
 
 """Simple Mako renderer.
 

tools/run_tests/run_tests.py

-#!/usr/bin/python
+#!/usr/bin/python2.7
 """Run tests in parallel."""
 
 import argparse