Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Remove example for linking /dev/vga to /dev/ttyv0, this hasn't been
required since X version 4.3.0.

PR: conf/161847
Submitted by: eadler
MFC after: 2 weeks

Update the example rules in devfs.conf to reflect the changes since ATA_CAM.
While here, add another example rule, as many applications these days
expect to find /dev/dvd instead.

MFC after: 3 days

Removed whitespace at BOF, EOL & EOF.

Allow users to configure stuff in /dev once again by re-doing the devfs
script to read /etc/devfs.conf, and take appropriate actions based on
what it finds there.

The (commented out) examples in the new devfs.conf file are taken in
part from the old rc.devfs script.