Land latest changes to v2020

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

Newer hotdoc (0.10) introduced several breaking changes which cause the
documentation to be misbuilt, so let's explicitly depend on the old version.

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

Signed-off-by: Frédéric Danis <frederic.danis@collabora.com>

apparmor-session-lockdown-no-deny test returns the following events:
$ sudo journalctl -b -t audit -o cat | aa_log_extract_tokens.sh DENIED
====
profile:/usr/bin/prestwood
apparmor:DENIED
denied_mask:r
operation:open
name:/proc/905/mountinfo
requested_mask:r
====
profile:/usr/bin/prestwood
apparmor:DENIED
denied_mask:r
operation:open
name:/etc/fstab
requested_mask:r
====
profile:/usr/bin/prestwood
apparmor:DENIED
denied_mask:r
operation:open
name:/proc/905/mountinfo
requested_mask:r
====
profile:/usr/bin/prestwood
apparmor:DENIED
denied_mask:r
operation:open
name:/proc/905/mounts
requested_mask:r

Signed-off-by: Frédéric Danis <frederic.danis@collabora.com>