Please add planned end-of-life date to Launchpad API

[Per Cederqvist]

Using the Launchpad API, it is easy to check if a given Ubuntu version is still supported:

import launchpadlib.launchpad

def supported(version):
    cachedir = os.path.join("/tmp/", "launchpadlib-%s" % os.getuid(), "cache")
    lp = launchpadlib.launchpad.Launchpad.login_anonymously('just testing',
                                                            'production',
                                                            cachedir)
    ubuntu = lp.distributions["ubuntu"]
    return ubuntu.getSeries(name_or_version=version).supported

I'm writing a Nagios check to ensure my machines are running a supported version of
Ubuntu. I'd like the check to return a warning state a couple of months before the
version reaches end-of-life, but as far as I can tell the end-of-life date is not avalable
via the Launchpad API. I'm aware of https://wiki.ubuntu.com/Releases but that page
is fairly hard to parse.

Proposal: add an end_of_life attribute to object returned by getSeries, that contains
the currently scheduled end-of-life date as a string in YYYY-MM-DD format.

Maybe you need two attributes, since the server and desktop systems sometimes
have different end-of-life dates.