UI related changes

1)Modify webui testbed files
2)Infra changes
Using ui_browser instead of webui or horizon
Using ui_browser instead of webui or horizon
Merge branch 'master' of https://github.com/Ankitja/contrail-fabric-utils
Modify install_webui_packages
Modify install_webui_packages
Modify install_webui_packages
Merge pull request #3 from Ankitja/master

UI related changes