[#52118273] Apply no-hosts option to clients as well

Move the `no-hosts` option from the server config to the default (used by
both server and client).

nsswitch/glibc/whatever should always check `hosts(5)` first, anyway.
There's no need for dnsmasq to ever serve these entries up. It will only
lead to confusion.
Merge pull request #1 from gds-operations/52118273-never_parse_etc_hosts

[Fixes #52118273] Apply no-hosts option to clients as well