Monitoring: install telegraf on A8 nodes automatically
Supports the installation of binary telegraf version A8 nodes in FIT/IoT-LAB platform.
Uses the when clauses on ansible to distinguish the different architectures. Uses the default docker installation for: ansible_architecture != "armv7l".
Huge refactor in installation process to use yml files for the different components: agent/collector/ui. The old version used priors to install python3/docker on hosts. However, we cannot use them in A8 nodes.
The yml files add these dependencies only if architecture != "armv7l".