* Resynchronise with Debian experimental. Remaining changes: (LP: #298488, LP: #663352) - ifupdown.nw: Use 100 as default route metric unless an explicit metric parameter is set in /etc/network/interface. - 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) - debian/postinst: If the loopback interface is missing from the config in /etc/network/interfaces, add it on upgrade. - Add jobs and hooks for upstart. * Cherry-pick commit 011d5904c09d from upstream, fixing cases where the error messages wouldn't be triggered (caused test failure). * Cherry-pick commit 7c1a226cc995 from upstream, adds support for two options on dhcpv6 (accept_ra and autoconf) (LP: #1013597) * Cherry-pick commit 5af7e814faee from upstream, fixing a failure in the example script generate-interfaces.pl (LP: #286808) * Cherry-pick commit a1f8efc4d93f from upstream, add --no-scripts as a parameter to ifup/ifdown, allowing the user to bypass the the scripts in /etc/network/if-*.d/ (LP: #258782)