all: changes from python 2 syntax to python3 and removing dead code

There were python 2 methods that are not used anymore so now
it's in python 3. Added helper fuctions so that the code is more clear

https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/540

examples/python/dbus/add-wifi-eap-connection.py

@@ -50,10 +50,9 @@ con = dbus.Dictionary(
         "ipv6": s_ip6,
     }
 )
-
+print("Creating connection:", s_con["id"], "-", s_con["uuid"])
 
 bus = dbus.SystemBus()
-
 proxy = bus.get_object(
     "org.freedesktop.NetworkManager", "/org/freedesktop/NetworkManager/Settings"
 )