Some applications, e.g. dnsmasq, do not allow hostnames starting with an underscore, therefor extend the existing hostname datatype validator with a `strict` which disallows a leading underscore. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Some applications, e.g. dnsmasq, do not allow hostnames starting with an underscore, therefor extend the existing hostname datatype validator with a `strict` which disallows a leading underscore. Signed-off-by: Jo-Philipp Wich <jo@mein.io>