Fix syntax error in telegraf config for softnet_stats

Need to escape quotes in the awk command

roles/telegraf/templates/telegraf.conf.j2

@@ -136,7 +136,7 @@
 
 [[inputs.exec]]
   commands = [
-    "awk -v hostname="$(hostname)" -f /opt/telegraf/bin/telegraf_softnet_stats.awk /proc/net/softnet_stat"
+    "awk -v hostname=\"$(hostname)\" -f /opt/telegraf/bin/telegraf_softnet_stats.awk /proc/net/softnet_stat"
   ]
   data_format = "influx"
   timeout="4s"