Update telegraf config to parse /proc/net/softnet_stat details

Hi Chris,

Can you please pick a node to test this new config on and tell me how it goes?

roles/telegraf/files/telegraf_softnet_stats.awk

+#! /usr/bin/awk -f
+
+{
+    printf("softnet,host=%s,cpu=%d sd_processed=%di,sd_dropped=%di,sd_time_squeeze=%di\n",
+        hostname,
+        NR-1,
+        strtonum("0x"$1),
+        strtonum("0x"$2),
+        strtonum("0x"$3)
+    )
+}
\ No newline at end of file