Disable Ubuntu unattended upgrade

`APT::Periodic::Update-Package-Lists` allows you to specify the frequency (in days)
at which the package lists are refreshed (0=disable).

`APT::Periodic::Unattended-Upgrade`
When this option is enabled, the daily script will execute unattended-upgrade from the `unattended-upgrades` package.
The default configuration file for the `unattended-upgrades` package is at `/etc/apt/apt.conf.d/50unattended-upgrades`
we're overriding it by writing the `51unattended-upgrades` file.

Related patches (for 3.0.0):
* aws/aws-parallelcluster#2915
* aws/aws-parallelcluster#3267

Signed-off-by: Enrico Usai <[email protected]>

Author: enrico-usai

CHANGELOG.md

@@ -11,6 +11,7 @@ This file is used to list changes made in each version of the AWS ParallelCluste
 - Upgrade Slurm to version 20.11.8.
 - Upgrade Cinc Client to version 17.2.29.
 - Upgrade NICE DCV to version 2021.2-11190.
+- Disable unattended upgrades for Ubuntu.
 
 2.11.3
 -----

amis/packer_ubuntu1804.json

@@ -167,7 +167,8 @@
     {
       "type": "shell",
       "inline": [
-        "sudo flock $(apt-config shell StateDir Dir::State/d | sed -r \"s/.*'(.*)\\/?'$/\\1/\")/daily_lock systemctl stop apt-daily.timer apt-daily.service apt-daily-upgrade.timer apt-daily-upgrade.service"
+        "sudo flock $(apt-config shell StateDir Dir::State/d | sed -r \"s/.*'(.*)\\/?'$/\\1/\")/daily_lock systemctl disable --now apt-daily.timer apt-daily.service apt-daily-upgrade.timer apt-daily-upgrade.service",
+        "sudo sh -c \"sed \\\"/Update-Package-Lists/s/1/0/; /Unattended-Upgrade/s/1/0/;\\\" /etc/apt/apt.conf.d/20auto-upgrades > /etc/apt/apt.conf.d/51pcluster-unattended-upgrades\""
       ]
     },
     {

amis/packer_ubuntu2004.json

@@ -167,7 +167,8 @@
     {
       "type": "shell",
       "inline": [
-        "sudo flock $(apt-config shell StateDir Dir::State/d | sed -r \"s/.*'(.*)\\/?'$/\\1/\")/daily_lock systemctl stop apt-daily.timer apt-daily.service apt-daily-upgrade.timer apt-daily-upgrade.service"
+        "sudo flock $(apt-config shell StateDir Dir::State/d | sed -r \"s/.*'(.*)\\/?'$/\\1/\")/daily_lock systemctl disable --now apt-daily.timer apt-daily.service apt-daily-upgrade.timer apt-daily-upgrade.service",
+        "sudo sh -c \"sed \\\"/Update-Package-Lists/s/1/0/; /Unattended-Upgrade/s/1/0/;\\\" /etc/apt/apt.conf.d/20auto-upgrades > /etc/apt/apt.conf.d/51pcluster-unattended-upgrades\""
       ]
     },
     {