statefiles: don't make hostsfile dependent on statefile

statefiles: don't make hostsfile dependent on statefile

Right now, the hosts file will only be created if the statefile is also
configured (and that fact isn't documented in the README.md, only in
commit logs (see 4bbc6e74248feeb756bd03dc500fb4f446ccfc49).

With this patch, the hostsfile is generated whether the statefile is
configured or not.

Signed-off-by: David Härdeman <[email protected]>
Link: https://github.com/openwrt/odhcpd/pull/302
Signed-off-by: Álvaro Fernández Rojas <[email protected]>