Update smoke tests to use cf CLI v8

[Carson Long]

What is this issue about?

v8 is the latest stable cf CLI release and we should use it in smoke tests.

What version of cf-deployment are you using?

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Please include the bosh deploy... command, including all the operations files (plus any experimental operation files you're using):

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Please provide output that helps describe the issue:

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What IaaS is this issue occurring on?

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Is there anything else unique or special about your setup?

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Tag your pair, your PM, and/or team!

N/A

[Dave Walter]

This work has been done. See cloudfoundry/cf-smoke-tests-release@adb3ff4 and 0d57130.