Make dired fontify pipes and sockets

* lisp/dired.el (dired-socket): New face for pipes and sockets
(bug#24547).
(dired-re-socket): New regexp to match them.
(dired-font-lock-keywords): Use them.
1 job for master in 84 minutes and 11 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
failed #2744
test-all

01:24:11

 
Name Stage Failure
failed
test-all Test
make[2]: *** [check-doit] Error 1
Makefile:318: recipe for target 'check-doit' failed
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:293: recipe for target 'check-expensive' failed
make[1]: *** [check-expensive] Error 2
make[1]: Leaving directory '/builds/emacs/emacs/test'
Makefile:959: recipe for target 'check-expensive' failed
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1