Bug#887501: systemctl should continue to use a pager automatically when interactive

[Josh Triplett]

As far as I can tell, while a couple of distributions may patch this
differently, the majority keep upstream's auto-pager behavior. As
described earlier in this bug, the tool that is having trouble with this
seems to be intentionally trying to make programs think they're running
interactively with a TTY. When doing so, other programs automatically
use a pager as well (e.g. git), and setting variables like PAGER=cat or
similar seems appropriate.

I don't think anything needs changing here.