the node-exporter does not need to run as scylla user. It can run
without scylla or without the scylla user being configure.
Signed-off-by: Amnon Heiman <amnon@scylladb.com>
This patch adds a service file for OS that supports systemd.
When started, it would run an already installed node_exporter or fail.
Signed-off-by: Amnon Heiman <amnon@scylladb.com>