Use the HVM Ubuntu stemcell in the end to end tests.
Use the HVM Ubuntu stemcell in the end to end tests.

[#107047114](https://www.pivotaltracker.com/story/show/107047114)

Signed-off-by: Aaron Hurley <6c541e38cb40b4360b80e64c308405691f38e38a@pivotal.io>

cloudfoundry-incubator/bosh-aws-cpi-release,cloudfoundry-incubator/bosh-aws-cpi-release,cloudfoundry-incubator/bosh-aws-cpi-release