Merge branch 'telegraf-1.15' into 'master'

Telegraf 1.15 nvidia_smi fix

See merge request !387

roles/telegraf/templates/inputs.nvidia_smi.conf.j2

+# Pulls statistics from nvidia GPUs attached to the host
+[[inputs.nvidia_smi]]
+## Optional: path to nvidia-smi binary, defaults to $PATH via exec.LookPath
+# bin_path = "/usr/bin/nvidia-smi"
+
+## Optional: timeout for GPU polling
+# timeout = "5s"
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