d3517d306c
Implement disk_add_alias to allow aliases to be added to disks. All disk have a primary name (say "foo") can also have secondary names (say "bar") such that all instances of "foo" also have a "bar" alias. So if you have foo0, foo0p1, foo1, foo1s1 and foo1s1a nodes created by the foo driver and gpart, device nodes bar0, bar0p1, bar1, bar1s1 and bar1s1a will appear as symlinks back to the original nodes. This generalizes to multiple aliases. However, since the unit number follows the primary name, multiple device drivers can't create the same aliases unless those drives coorinate the unit number space (eg you couldn't add an alias 'disk' to both 'da' and 'ada' because it's possible to have da0 and ada0, because 'disk0' is ambiguous). Differential Revision: https://reviews.freebsd.org/D11873
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