apache2: Always enable SNI

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
rsync: Fix invalid auth users

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
rsync: Make read-only mode configurable

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>