Extract vmDeployer from deployer

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>
Wait for existing vm to respond before deploy

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>
disk.Find -> disk.FindCurrent

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>