update python to use test spec

samples/client/petstore/python/test_python2.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+REQUIREMENTS_FILE=dev-requirements.txt
+REQUIREMENTS_OUT=dev-requirements.txt.log
+SETUP_OUT=*.egg-info
+VENV=.venv
+DEACTIVE=false
+
+### set virtualenv
+if [ -z "$VIRTUAL_ENV" ]; then
+		virtualenv $VENV --no-site-packages --always-copy
+		source $VENV/bin/activate
+    DEACTIVE=true
+fi
+
+### install dependencies
+pip install -r $REQUIREMENTS_FILE | tee -a $REQUIREMENTS_OUT
+python setup.py develop
+
+### run tests
+nosetests
+
+### deactivate virtualenv
+if [ $DEACTIVE == true ]; then
+    deactivate
+fi
+