Fix vm_creator env interpolation
Fix vm_creator env interpolation

- Create a config server client for each  vm created
  as it seems the client fails because of concurrency
  issues when creating VMs in parallel

[#126620993](https://www.pivotaltracker.com/story/show/126620993)

Signed-off-by: Jamil Shamy <1a6c312d8b7ebde5d54d0b4f1a4353b7c149e3bf@pivotal.io>

barthy1/bosh,barthy1/bosh,barthy1/bosh,barthy1/bosh