NGINX agent-local script

The nginx script for linux system on Python3 (default on Ubuntu 20.04) returns several errors regarding the deprecation of some functions / libraries.

On python3, urllib2 is not used in favor of urlib.request

On python3, print "" is not used in favor of print()

To fix this and allow compatibility, adding a "try" for the lib and change the fetch function could allow python2 and python3 requests.

try:

 from urllib.request import urlopen < python3

except ImportError:

 from urllib2 import urlopen < the fall back to python2

 When using urllib, because of the next part of the code, we need to add '.decode('utf8')'

data = urlopen('http://localhost/nginx-status').read().decode('utf-8')