Make role idempotent and controllable by variables in addition to --skip-tags

[l4r-s]

Hi

It would be nice if this role would be idempotent (only show changed on an ansible task if it realy changed somtehing on the system).
Furthermore --skip-tags setup_filesystem is prone to error because it is not the default behavior when running ansible.

This PR tries to fix this while remaining backwards compatible.

It changes the following:

• only show changed on an ansible task if it realy changes something on the system (makes it easy to re-run the role more than once)
• Ensure the needed kernel params in GRUB_CMDLINE_LINUX are only present once. Even if they are already defined in different order
• Reboot after GRUB_CMDLINE_LINUX is changed (controllable with ece_do_bootloader_reboot)
• Only execute Update if the ece_version number is higher than the running one
• Use ece_do_* variables in addition to the --skip-tags functionality (the default value of the variables represent the same behavior as it would be used with the --skip-tags)
• Implement ece_do_cloudinit to disable all cloud-init related tasks
• Use handler to restart docker service if something changes, instead of stopping it and starting it with every run
• Changing {{ data_dir }}/docker to elastic User and group makes IMHO no sense, since the docker service will change it back to root after a restart. So this PR removes it

[cla-checker-service]

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