[bug#54352] [PATCH v2] services: dnsmasq: Add more options.

[Remco van 't Veer]

> What is an ‘arbitrary identify string’ here?  What does ‘cpe’ mean?
> How can I know if I need to set this, and how do I know what to set it
> to?

I think it stands for "Common Platform Enumerator" but I am not really
sure.  It's used by DNS providers to identify the client so they know
for what account they are resolving.  Looking at the dnsmasq code base
this option used to be called "dns-client-id" which is a lot clearer.  I
could change it to this older name and describe it as above.  WDYT?