libguestfs security, bug fix, and enhancement update

1:1.20.11-2 - Fix CVE-2013-4419: insecure temporary directory handling for guestfish's network socket resolves: rhbz1019737 1:1.20.11-1 - Rebase to libguestfs 1.20.11. resolves: rhbz958183 - Remove buildnet: builds now detect network automatically. - The rhel-6.x branches containing the patches...