rpmdeps is collecting dependancies for binary packages (bin_package) and do_package_qa throws a warning if deps are missing because "file-rdeps" is in WARN_QA. 

If RPM is in PACKAGE_CLASSES, smart will be intelligent enough to throw an error on do_rootfs (e.g. do_rootfs: Unable to install packages... smart returns -1).

However, if we only have IPK in PACKAGE_CLASSES, we only get the QA warning, and binaries with missing dependancies are possibly installed on the target.

I see two ways of fixing this:

1. Add file-rdeps to the list of ERROR_QA if inheriting from bin_package.
(rather heavy handed)

2. Create a bin_validation class that specifically checks for these types of errors. (possibly using something like IMAGE_QA_COMMANDS)

I'm leaning towards option 2.