NetworkManager configuration to enable connectivity checking

 This package contains a configuration file which enables NetworkManager's
 connectivity checking functionality.
 .
 NetworkManager will try to connect to an Ubuntu server to determine the
 connection status.
 .
 This is particularly useful for captive portal detection.
 .
 No user data is transmitted in the connectivity checks, but merely contacting
 the Ubuntu connectivity check servers reveals that the user is running an
 Ubuntu(-based) operating system with NetworkManager.