* Merge from Debian. Remaining changes: - If the /etc/NetworkManager/NetworkManager.conf file is present but doesn't have the "ifupdown:managed" the previous upload instructed the iniparser to return -1, which evaluates to TRUE. We instead instruct it to return 0, as we shouldn't prevent ifupdown from managing the interfaces in that case, as NM won't either. (LP: #281984) - Remove /etc/default/networking as the upstart job doesn't use it and can't really use it without some significant changes (support exclusion lists in all the upstart jobs). - Add transition code for moving /etc/init.d/networking from netbase to ifupdown. - Make /etc/init.d/networking exit 1 immediately on Upstart system with an error message telling the user to use 'service'. - Always call dhclient with -1, Ubuntu carries a patch so that renewal won't time out.