Updating debian changelog and adding requirement

httplib2 is a dependency of sword2, and needs to be
added explicitly to the requirements file of the storage service
because sword2 source is included in the lib dir now, not downloaded.
Delete Requests: Deleted packages are not always AIPs

refs #7132

Packages being deleted are not always AIPs - get package type from request.
Fix raise to return
Packaging: port to dh_virtualenv 0.8.x