Added updated python script

Luckily this person knows more python than me: https://gist.github.com/fastjack/a0feb792a9655da7aa3e2a7a1d9f812f

plugins/telegraf_gateways-3.7.py

@@ -0,0 +1,21 @@
+#!/usr/local/bin/python3.7
+
+# telegraf_gateways-3.7.py
+# https://gist.github.com/fastjack/a0feb792a9655da7aa3e2a7a1d9f812f#file-gateways-py-for-pfsense-2-4-5
+# Special thanks to fashjack - https://gist.github.com/fastjack
+
+import glob, os, socket
+
+DPINGER_SOCK_PATH = "/var/run/"
+
+os.chdir(DPINGER_SOCK_PATH)
+
+for sock_name in glob.glob("dpinger*.sock"):
+    sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+    sock_path = DPINGER_SOCK_PATH+sock_name
+    s = sock.connect(sock_path)
+    line = sock.recv(1024).decode().split('\n', 1)[0]
+    values = line.split()
+    print("gateways,gateway_name="+values[0]+" rtt="+str(int(values[1])/100.0)+ \
+          ",rttsd="+str(int(values[2])/100.0)+",loss="+str(int(values[3]))+"i")
+    sock.close()