Supporting 'port livecheck installed'

[Chris Jones]

It is intentional that the version specific py ports have livecheck none. The idea is you don’t need every one of the versions performing the check, only the non versioned port.

> On 31 Aug 2019, at 5:50 pm, Blair Zajac <blair at orcaware.com> wrote:
> 
> I care about such ports, e.g. py37-tensorflow and py37-virtualenv, so I would have that in requested. So that appears to not directly solve the issue.
> 
>> On Aug 31, 2019, at 9:16 AM, Jeremy Lavergne <jeremy at lavergne.me> wrote:
>> 
>> As an alternative or workaround, would narrowing to `port livecheck requested` be useful for you?
>> 
>> 
>>> On 8/31/19 11:58 AM, Blair Zajac wrote:
>>> Hi all,
>>> It appears a number of ports, particularly py-* ports, use “livecheck.type none”. I find running ‘port livecheck installed’ a handy way to see if any of the ports I care about have an update, however, this doesn’t work for the py-* ones.
>>> Can something be changed to support this? Would the livecheck code need to specially handle the port name when ${name} is a py??-* variant?
>>> Blair
>> 
>