fix: fix logmessage for usage with domain names

[panavenue]

issue: #936

Instead of using the original string() method which contains the dns name. Update it to follow the standard icn name standard.

[hessjcg]

Maybe we could do something like this:

	// Log if resolver changed the instance name input string.
	// icn = "pro:reg:inst" -> cn = "pro:reg:inst" cn.String() = "pro:reg:inst"
	// icn = "example.com" -> cn = "example.com", "pro:reg:inst" cn.String() = "example.com -> pro:reg:inst"
	// icn = "my-custom-name" -> cn = "pro:reg:inst" cn.String() = "pro:reg:inst"
	if cn.DomainName != "" {
	    // icn is a domain name
		d.logger.Debugf(ctx, "resolved instance domain name %s to %s", icn, ... pro:reg:inst)
	}
	else if cn.String() != icn {
	    // icn was not a domain name, but the resolver changed it and cn != icn
		d.logger.Debugf(ctx, "resolved instance connection string %s to %s", icn, cn)
	}

[panavenue]

Maybe we could do something like this:

	// Log if resolver changed the instance name input string.
	// icn = "pro:reg:inst" -> cn = "pro:reg:inst" cn.String() = "pro:reg:inst"
	// icn = "example.com" -> cn = "example.com", "pro:reg:inst" cn.String() = "example.com -> pro:reg:inst"
	// icn = "my-custom-name" -> cn = "pro:reg:inst" cn.String() = "pro:reg:inst"
	if cn.DomainName != "" {
	    // icn is a domain name
		d.logger.Debugf(ctx, "resolved instance domain name %s to %s", icn, ... pro:reg:inst)
	}
	else if cn.String() != icn {
	    // icn was not a domain name, but the resolver changed it and cn != icn
		d.logger.Debugf(ctx, "resolved instance connection string %s to %s", icn, cn)
	}

Good call! I think I get the logic now.

I modified a bit for the cn.DomainName != "" part, because cn.String() already in a correct format of "DomainName -> ICN"

[hessjcg]

Approved with the small log message change.