Merge pull request #2630 from michael-berlin/stop_printing_python2_bi…

…naries

Suppress output when checking for python2 binaries.

dev.env

@@ -36,11 +36,11 @@ export PYTHONPATH=$(prepend_path $PYTHONPATH $VTTOP/test)
 export PYTHONPATH=$(prepend_path $PYTHONPATH $VTTOP/test/cluster/sandbox)
 
 # Ensure bootstrap and install_grpc use python2 on systems which default to python3
-command -v python2 && PYTHON=python2 || PYTHON=python
+command -v python2 >/dev/null && PYTHON=python2 || PYTHON=python
 export PYTHON
-command -v pip2 && PIP=pip2 || PIP=pip
+command -v pip2 >/dev/null && PIP=pip2 || PIP=pip
 export PIP
-command -v virtualenv2 && VIRTUALENV=virtualenv2 || VIRTUALENV=virtualenv
+command -v virtualenv2 >/dev/null && VIRTUALENV=virtualenv2 || VIRTUALENV=virtualenv
 export VIRTUALENV
 
 selenium_dist=$VTROOT/dist/selenium