Added a build.py script for compiling and packaging. Added post and pre install scripts to handle installation and upgrades in a cleaner way. Minor fixes to the init script and service unit file.

scripts/pre-install.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+if [[ -f /etc/opt/telegraf/telegraf.conf ]]; then
+    # Legacy configuration found
+    if [[ ! -d /etc/telegraf ]]; then
+	# New configuration does not exist, move legacy configuration to new location
+	echo -e "Please note, Telegraf's configuration is now located at '/etc/telegraf' (previously '/etc/opt/telegraf')."
+	mv /etc/opt/telegraf /etc/telegraf
+
+	backup_name="telegraf.conf.$(date +%s).backup"
+	echo "A backup of your current configuration can be found at: /etc/telegraf/$backup_name"
+	cp -a /etc/telegraf/telegraf.conf /etc/telegraf/$backup_name
+    fi
+fi