Alias support

[lu-zero]

See https://github.com/rust-italia/mdev/blob/master/src/bin/mdev.rs#L146

mdevd does this way

• Expand aliases terminating in / by appending the kernel device name to it. e.g.: >alias/ -> >alias/nodename are equivalent.
• Either replace the devname or create a symlink to it.
• Support not creating the device.

Examples:

loop([0-9]+)       root:disk 660 >loop/%1

adsp        root:audio 660 >sound/