Merge branch 'a8_telegraf_auto' into 'master'

docs/tutorials/iotlab.rst

docs/tutorials/iotlab/tuto_iotlab_a8_monitoring.py

enoslib/service/monitoring/monitoring.py

enoslib/service/monitoring/monitoring.yml

enoslib/service/monitoring/roles/agent/defaults/main.yml

enoslib/service/monitoring/roles/agent/meta/main.yml

enoslib/service/monitoring/roles/agent/tasks/binary.yml

enoslib/service/monitoring/roles/agent/tasks/config.yml

enoslib/service/monitoring/roles/agent/tasks/container.yml

enoslib/service/monitoring/roles/agent/tasks/deploy.yml

enoslib/service/monitoring/roles/agent/tasks/destroy.yml

enoslib/service/monitoring/roles/agent/tasks/main.yml

...service/monitoring/roles/agent/templates/telegraf.conf.j2

enoslib/service/monitoring/roles/collector/meta/main.yml

enoslib/service/monitoring/roles/collector/tasks/backup.yml

enoslib/service/monitoring/roles/collector/tasks/deploy.yml

enoslib/service/monitoring/roles/collector/tasks/destroy.yml

enoslib/service/monitoring/roles/collector/tasks/main.yml

enoslib/service/monitoring/roles/docker/tasks/main.yml

enoslib/service/monitoring/roles/python3/tasks/main.yml