Redirect build_python.sh to requirements.txt
diff --git a/tools/run_tests/build_python.sh b/tools/run_tests/build_python.sh
index dc5bacc..d0f09e4 100755
--- a/tools/run_tests/build_python.sh
+++ b/tools/run_tests/build_python.sh
@@ -37,6 +37,6 @@
rm -rf python2.7_virtual_environment
virtualenv -p /usr/bin/python2.7 python2.7_virtual_environment
source python2.7_virtual_environment/bin/activate
-pip install enum34==1.0.4 futures==2.2.0 protobuf==3.0.0a2
+pip install -r src/python/requirements.txt
CFLAGS=-I$root/include LDFLAGS=-L$root/libs/$CONFIG pip install src/python/src
pip install src/python/interop