1.	Removing activate venv in contrail-test/scripts/scale/control-node/params.ini
2.	Dynamic dict removal in contrail-test/fixtures/webui_test.py
3.	Subprocess.check_output not available in python 2.6 so monkey patched from http://stackoverflow.com/questions/4814970/subprocess-check-output-doesnt-seem-to-exist-python-2-6-5
In contrail-test/scripts/contrail_test_init.py
Merge pull request #386 from Juniper/arvindv_centos_followup

1.	Removing activate venv in contrail-test/scripts/scale/control-node/pa...