Bodgitlib::Domain $dns_discovery_main does not allow for SRV records

[jhoblitt]

In sssd::domain, the dns_discovery_domain is being validated as a Bodgitlib::Domain. This is problematic as SSSD isn't actually asking for domain but a FQDN or SRV.

  Optional[Bodgitlib::Domain]                                                           $dns_discovery_domain 

I have been setting this value to something like dev._locations.example.com.

[jhoblitt]

I'm having trouble coming up with a type alias that will exclude non SRV records. puppetlabs/puppetlabs-stdlib#1230