rune/libenclave: Use oneof to distinguish default value and missing value in pb3

If not distinguish default value and missing value in pb3, pb3 will drop default value
in protobuf requests.
Signed-off-by: NYilin Li <YiLin.Li@linux.alibaba.com>

rune/libenclave/intelsgx/aesmd.go

@@ -304,10 +304,10 @@ func GetQuote(report []byte, spid string, linkable bool) ([]byte, error) {
 	req := pb.AesmServiceRequest{}
 	req.GetQuote = &pb.AesmServiceRequest_GetQuote{
 		Report:           report,
-		QuoteType: t,
+		QuoteTypePresent: &pb.AesmServiceRequest_GetQuote_QuoteType{QuoteType: t},
 		Spid:             s,
 		BufSize:          SgxMaxQuoteLength,
-		QeReport:  false,
+		QeReportPresent:  &pb.AesmServiceRequest_GetQuote_QeReport{QeReport: false},
 		Timeout:          10000,
 	}
 

rune/libenclave/intelsgx/proto/aesm-service.proto

@@ -12,12 +12,16 @@ message AesmServiceRequest {
 
     message GetQuote {
         bytes report      = 1;
+        oneof quote_type_present {
                 uint32 quote_type = 2;
+        }
         bytes spid        = 3;
         bytes nonce       = 4;
         bytes sig_rl      = 5;
         uint32 buf_size   = 6;
+        oneof qe_report_present {
                 bool qe_report = 7;
+        }
         uint32 timeout    = 9;
     }