Update Vagrantfile
Update Vagrantfile

1. Update for ScaleIO 1.3
2. Update and support for proxies if the vagrant-proxyconf plugin is installed.
codedellemc/vagrant,emccode/vagrant,codedellemc/vagrant,emccorp/vagrant-scaleio-flocker,jonasrosland/vagrant-scaleio,Azulinho/vagrant-scaleio-flocker,emccorp/vagrant-scaleio-flocker,codedellemc/vagrant,emccode/vagrant,emccode/vagrant