Make message printed after bootstrap slightly less confusing
diff --git a/bootstrap/dev/_venv_common.sh b/bootstrap/dev/_venv_common.sh
index 2d84dc39b47..d07f38ed8d0 100755
--- a/bootstrap/dev/_venv_common.sh
+++ b/bootstrap/dev/_venv_common.sh
@@ -21,5 +21,6 @@ pip install -U setuptools
 pip install -U pip
 pip install "$@"
 
+set +x
 echo "Please run the following command to activate developer environment:"
 echo "source $VENV_NAME/bin/activate"

![setx1](https://cloud.githubusercontent.com/assets/1378718/10774828/ef5d8c3e-7d29-11e5-8f50-1833b3e101ca.png)
vs.
![setx2](https://cloud.githubusercontent.com/assets/1378718/10774830/f8324e80-7d29-11e5-9cfd-e03820a9f080.png)
