server: make warning about nonlocal bind more clear

6 jobs for master in 8 minutes and 55 seconds (queued for 1 second)
Status Job ID Name Coverage
  Configure
passed configure:debian:stretch:amd64 #3604
docker linux amd64

00:02:21

passed configure:ubuntu:amd64 #3603
docker linux amd64

00:01:56

 
  Build
passed build:debian:stretch:amd64 #3606
docker linux amd64

00:02:55

passed build:ubuntu:amd64 #3605
docker linux amd64

00:02:41

 
  Test
passed test:debian:stretch:amd64 #3608
docker linux amd64

00:03:37

passed test:ubuntu:amd64 #3607
docker linux amd64

00:03:12