Comment 13 for bug 1177432

I've committed the change to trunk that actually puts the template now inline with what is provided by 14.04 and 15.10 server iso installs (as seen in those attachments above).

I've also added tools to https://gist.github.com/smoser/5586288 and some more information. This illustrates well my desire for '--if-necessary' as requested in bug 1429285.

To summarize the changes below. That is roughly 450k additional download data (compressed size). Most notable is a stark doubling of GETs from 27 to 58:

    ## old cloud sources.list after "apt-get clean"
    $ ./summarize-http out.d/cloud/clean/update.err
    ...
    data bytes: 14431826
    total GETS: 27
    200: 16
    404: 11

    ## old cloud sources.list immediately repeated 'apt-get update'
    $ ./summarize-http out.d/cloud/noclean/update.err
    ...
    data bytes: 0
    total GETS: 27
    304: 16
    404: 11

    ## ISO sources.list after "apt-get clean"
    $ ./summarize-http out.d/cd/clean/update.err
    ...
    data bytes: 14893753
    total GETS: 58
    200: 37
    404: 21

    ## ISO sources.list immediately repeated 'apt-get update'
    $ ./summarize-http out.d/cd/noclean/update.err
    ...
    data bytes: 0
    total GETS: 58
    304: 37
    404: 21