Security updates for Thursday

Security updates have been issued by Arch Linux (git, libgit2, and shadow), Debian (debian-edu-config and python-django), Fedora (python-django), Mageia (apache-commons-beanutils, fence-agents, flightcrew, freerdp, htmldoc, libssh, pacemaker, rsyslog, samba, and sssd), Oracle (freetype and kernel), Scientific Linux (freetype and kernel), SUSE (firefox, spectre-meltdown-checker, thunderbird, xen, and zziplib), and Ubuntu (python-django).