Cfy 1445 create vsphere system tests framework

Added vSphere system tests framework and one basic test
The flow is: 
1. use local import in blueprint to /plugin.yaml
2. download the plugin.yaml (rawgit) from s3 (for now its the master version) and place it in the blueprint dir
3. replace the place holder inside the plugin with the token (to access the private tar)
Note: I removed the branch and the base url which is not relevant anymore