Merge pull request #159 from vedujoshi/master

A better check to whether run in venv or not
check and run within venv it it exist
add new task to modify agent parameters
changed task to modify agent parameters only if specified in testbed.py
Edited  README.md.
Merge pull request #160 from Juniper/ijohnson_readme_change

Edited  README.md.
Update README.md
Task for setting up interface configuration per node.
Skip provisioning interface is control_data dict not specified.
Merge pull request #161 from Juniper/ijohnson_setup_interface_node

Task for setting up interface configuration per node.
changes for ci sanity to pick cirros image
Merge pull request #163 from Juniper/kparmar_ci_sanity-master

changes for ci sanity to pick cirros image
change keyname CIRROS_IMAGE to GUESTVM_IMAGE
Merge pull request #165 from Juniper/kparmar-changeimagenamekey-master

change keyname CIRROS_IMAGE to GUESTVM_IMAGE
Support for Contrail High Availabity.
Merge pull request #167 from Juniper/ijohnson_ha

Support for Contrail High Availabity.