Run the puppet apply test (requires sudo)

The test.sh script is not currently being run in any jobs, this change
removes the redundant validation code that's also in the puppet-syntax
job and creates a puppet-apply-test job that runs the test.sh script.

Running `puppet apply --noop` requires sudo, otherwise it will give
errors about refusing to run commands as other users.

Change-Id: Ie6b278d98390a8a5dd8bb24899c8c4083f5755c9