Security updates for Tuesday

Security updates have been issued by Arch Linux (python-django and python2-django), Debian (heimdal), Fedora (kernel, kernel-headers, kernel-tools, and sqlite), openSUSE (containerd, docker, docker-runc, go, go1.11, go1.12, golang-github-docker-libnetwork and GraphicsMagick), Oracle (thunderbird), Red Hat (systemd and thunderbird), SUSE (bind and firefox), and Ubuntu (qtbase-opensource-src).