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When the NodeAttrDNSSubdomainResolve capability is present, enable wildcard certificate issuance to cover all single-level subdomains of a node's CertDomain. Without the capability, only exact CertDomain matches are allowed, so node.ts.net yields a cert for node.ts.net. With the capability, we now generate wildcard certificates. Wildcard certs include both the wildcard and base domain in their SANs, and ACME authorization requests both identifiers. The cert filenames are kept still based on the base domain with the wildcard prefix stripped, so we aren't creating separate files. DNS challenges still used the base domain The checkCertDomain function is replaced by resolveCertDomain that both validates and returns the appropriate cert domain to request. Name validation is now moved earlier into GetCertPEMWithValidity() Fixes #1196 Signed-off-by: Fernando Serboncini <fserb@tailscale.com>