MFC r275681:
Add "-media" autofs map, to access data on removable media, such as CD
drives or flash keys. It can be enabled by uncommenting a single entry
in default /etc/auto_master. It can also be easily modified to use
fuse-based filesystems instead of in-kernel ones.
There is still one deficiency - the mountpoints are permanent, they
don't disappear when user removes the media. Fixing it needs some
autofs changes.
Relnotes: yes
Sponsored by: The FreeBSD Foundation
git-svn-id: svn://svn.freebsd.org/base/stable/10@283223
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