Begin testing infrastructure specifics of stemcells

Signed-off-by: Abhijit Hiremagalur <abhi@pivotallabs.com>
Move etc/infrastructure into /var/vcap/bosh

Since it is specific to BOSH and not something that would normally be
part of the OS.

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>
Pass infrastructure in once

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>