x11: Be quiet on exit by default

The condition we check for to catch X servers going away
may not be accurate anymore, and the warning shows up in
logs, causing customers to be concerned. So, be quiet by
default, unless the user explicitly asked for a message.
12 jobs for x11-quiet-exit in 42 minutes and 50 seconds (queued for 1 second)
Status Job ID Name Coverage
  .Pre
passed #1251420
style-check-diff

00:04:04

 
  Build
passed #1251421
fedora-x86_64

00:23:21

passed #1251423
installed-tests

00:06:37

passed #1251425
macos
macos

00:12:42

passed #1251424
win32-ps
msys2-mingw64

00:05:48

passed #1251422
release-build

00:21:56

 
  Analysis
failed #1251427
asan allowed to fail
asan-build

00:04:49

passed #1251426
static-scan

00:42:49

 
  Docs
passed #1251428
reference

00:06:23

 
  Flatpak
manual #1251429
flatpak allowed to fail manual
flatpak-manual:demo
manual #1251431
flatpak allowed to fail manual
flatpak-manual:icon-browser
manual #1251430
flatpak allowed to fail manual
flatpak-manual:widget-factory
 
Name Stage Failure
failed
asan-build Analysis
 - css: 214 total, 214 pass, 0 fail
Processing gtk suite a11y:
- a11y: 22 total, 22 pass, 0 fail
Processing gtk suite tools:
- tools: 4 total, 3 pass, 1 fail
Processing gtk suite reftest:
- reftest: 132 total, 131 pass, 1 fail
Cleaning up file based variables
ERROR: Job failed: exit code 1