Automate Control-VM creation

[v-yussupov]

During the first step in Run Benchmarks tab there should be an option for user to create Control-VM automatically. This should include following steps:

1. generation of SSH keypair
2. showing user the dialog similar to one in Instances tab
3. after user presses Create, an instance is created
4. generate a new floating IP
5. attach floating IP to an instance
6. put newly created instance into selectedInstance knockout.js variable