[Qa-jenkins-scm] Fixed: chroot-installation_stretch_bootstrap_upgrade_to_sid_aptdpkg_first/108

[jenkins at jenkins.debian.net]

See https://jenkins.debian.net/job/chroot-installation_stretch_bootstrap_upgrade_to_sid_aptdpkg_first/108//console or just https://jenkins.debian.net/job/chroot-installation_stretch_bootstrap_upgrade_to_sid_aptdpkg_first/108/ for more information.