New: net/thingsd 2.7.1

Hello ports,

Here is a new 2.7.1 release of thingsd, bumping PLIST user to 836 and
includes a couple of fixes in the software.

Is anyone willing to import this? It's received several oks, thus far.

Thanks,

Tracey

Changelog:

* Alert child when control socket closes, so it can clean up items
* Reintroduce logging levels to thingsctl
* Fix missed free on various strndups
* Remove superfluous file