misc/ios: skip revoked certificates

Change-Id: If65e5e55b359a61740d2ef185147bb6df90e0b0c
Reviewed-on: https://go-review.googlesource.com/14654
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>

misc/ios/detect.go

@@ -55,6 +55,9 @@ func detectDevID() string {
 		if !bytes.Contains(line, []byte("iPhone Developer")) {
 			continue
 		}
+		if bytes.Contains(line, []byte("REVOKED")) {
+			continue
+		}
 		fields := bytes.Fields(line)
 		return string(fields[1])
 	}