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	This PR adds the *root* middleware that specifies a path where all zone file (the *file* middleware is the only consumer now) can be found. It works the same as in Caddy. Documentation can be found in the README.md of the middleware. Fixes #307
secondary
secondary enables serving a zone retrieved from a primary server.
Syntax
secondary [ZONES...]
- ZONES zones it should be authoritative for. If empty, the zones from the configuration block are used. Note that without a remote address to get the zone from, the above is not that useful.
A working syntax would be:
secondary [zones...] {
    transfer from ADDRESS
    [transfer to ADDRESS]
}
- transfer fromspecifies from which address to fetch the zone. It can be specified multiple times; if one does not work, another will be tried.
- transfer tocan be enabled to allow this secondary zone to be transferred again.
Examples
secondary example.org {
    transfer from 10.0.1.1
    transfer from 10.1.2.1
}