manpages for interfaces(5) uses two different source packages across releases

[Ryan Harper]

Looking at manpages.ubuntu.com for interfaces(5) and there are two different source packages that get referenced:

12.04 -> 15.10 we see ifupdown_0.X as the source

http://manpages.ubuntu.com/manpages/trusty/en/man5/interfaces.5.html

16.04 and newer point to ifupdown2 which is in universe, not main.

http://manpages.ubuntu.com/manpages/xenial/en/man5/interfaces.5.html

I don't think we should be pointing to ifupdown2 which it's not in main

% rmadison ifupdown
 ifupdown | 0.7~beta2ubuntu8 | precise | source, amd64, armel, armhf, i386, powerpc
 ifupdown | 0.7~beta2ubuntu11.1 | precise-updates | source, amd64, armel, armhf, i386, powerpc
 ifupdown | 0.7.47.2ubuntu4 | trusty | source, amd64, arm64, armhf, i386, powerpc, ppc64el
 ifupdown | 0.7.47.2ubuntu4.4 | trusty-updates | source, amd64, arm64, armhf, i386, powerpc, ppc64el
 ifupdown | 0.7.48.1ubuntu10 | vivid | source, amd64, arm64, armhf, i386, powerpc, ppc64el
 ifupdown | 0.8.10ubuntu1 | xenial | source, amd64, arm64, armhf, i386, powerpc, ppc64el, s390x
 ifupdown | 0.8.10ubuntu1.2 | xenial-updates | source, amd64, arm64, armhf, i386, powerpc, ppc64el, s390x
 ifupdown | 0.8.13ubuntu2 | yakkety | source, amd64, arm64, armhf, i386, powerpc, ppc64el, s390x
 ifupdown | 0.8.13ubuntu3 | yakkety-updates | source, amd64, arm64, armhf, i386, powerpc, ppc64el, s390x
 ifupdown | 0.8.16ubuntu1 | zesty | source, amd64, arm64, armhf, i386, ppc64el, s390x

% rmadison ifupdown2
 ifupdown2 | 1.0~git20151029-1 | xenial/universe | source, all
 ifupdown2 | 1.0~git20160525-1 | yakkety/universe | source, all
 ifupdown2 | 1.0~git20170114-1 | zesty/universe | source, all