Remove ASK/ARK warnings

The ASK and ARK ought to be embedded in the Verifier and are not
necessary for the host to forward. AWS EC2 does not provide the ASVK or
ARK, so drop the nuisance warnings.

abi/abi.go

@@ -875,13 +875,6 @@ func (c *CertTable) Proto() *pb.CertificateChain {
 	if len(result.VcekCert) == 0 && len(result.VlekCert) == 0 {
 		logger.Warning("Warning: Neither VCEK nor VLEK certificate found in data pages")
 	}
-
-	if len(result.AskCert) == 0 {
-		logger.Warningf("ASK certificate not found in data pages")
-	}
-	if len(result.ArkCert) == 0 {
-		logger.Warningf("ARK certificate not found in data pages")
-	}
 	return result
 }