I would like to reserve UID/GID 290 for netdata (net-analyzer/netdata)

We currently use dynamic UID/GIDs. Upstream uses 201/201 [1] but Gentoo 
already uses that for qmail [2], so I've randomly selected new UIDs/GIDs 
(290/290).

Here's a PR for this change [3].

[1] 
https://github.com/netdata/netdata/blob/e2e20dad1fc29dcd6bd76b6dc50c80045d0a2956/packaging/docker/Dockerfile#L59
[2] https://api.gentoo.org/uid-gid.txt
[3] https://github.com/gentoo/gentoo/pull/12910

Thanks,
~Craig