WIP: Intel microcode

This includes :

• Installing intel microcode on min+ env via Puppet (bug 8869)

Jenkins generation :

• https://intranet.grid5000.fr/jenkins/view/Environments/job/env_generate_snapshot_debian10/26/
• https://intranet.grid5000.fr/jenkins/view/Environments/job/env_generate_snapshot_debian9/51/
• https://intranet.grid5000.fr/jenkins/view/Environments/job/env_generate_snapshot_other/

Jenkins tests :

• https://intranet.grid5000.fr/jenkins/view/Environments/job/env_test_snapshot_debian10/383/
• https://intranet.grid5000.fr/jenkins/view/Environments/job/env_test_snapshot_debian9/2869/
• https://intranet.grid5000.fr/jenkins/view/Environments/job/env_test_snapshot_other/6098/