Rudder

We already have the "package_verify" bundle but that runs a "warn only" CFEngine packages promise that uses the "addupdate" package_policy, so reports that a package needs updating even if already installed.

We need a simpler bundle that just reports whether a package is installed or not. We have some concerns about how CFEngine will manage this, so have written an extensive test case to simulate the case where a package is installed but upgradable, to ensure the result is as expected.