tests: staging tests must be run as root
tests: staging tests must be run as root

Because iptables restricts what www-data can do, including
connecting to arbitrary TCP port and therefore successfully running
firefox and the selenium driver.

conorsch/securedrop,ehartsuyker/securedrop,conorsch/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,heartsucker/securedrop,heartsucker/securedrop,conorsch/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,conorsch/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,conorsch/securedrop,ehartsuyker/securedrop