Adds config test to ensure build VM packages are up-to-date
Adds config test to ensure build VM packages are up-to-date

Guards against regressions where we're building packages without having
the latest distribution-provided updates installed.

heartsucker/securedrop,conorsch/securedrop,conorsch/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,conorsch/securedrop,garrettr/securedrop,micahflee/securedrop,heartsucker/securedrop,ageis/securedrop,micahflee/securedrop,heartsucker/securedrop,conorsch/securedrop,micahflee/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,garrettr/securedrop,ehartsuyker/securedrop,ageis/securedrop,micahflee/securedrop,garrettr/securedrop,garrettr/securedrop,ageis/securedrop,heartsucker/securedrop,conorsch/securedrop,ageis/securedrop