issue #291: missing env_wrapper.sh test script.

tests/data/env_wrapper.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+# This script exists to test the behavior of Stream.python_path being set to a
+# list. It sets an environmnt variable that we can detect, then executes any
+# arguments passed to it.
+export EXECUTED_VIA_ENV_WRAPPER=1
+if [ "${1:0:1}" == "-" ]; then
+    exec "$PYTHON" "$@"
+else
+    export ENV_WRAPPER_FIRST_ARG="$1"
+    shift
+    exec "$@"
+fi