- querylogs: GET /control/querylog: "service_name" field wasn't set

Squashed commit of the following:

commit a6571d483c8b5af6c051fb2fc08661d609a4e3d0
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Tue Sep 22 17:27:54 2020 +0300

    - querylogs: GET /control/querylog: "service_name" field wasn't set

AGHTechDoc.md

@@ -1423,6 +1423,7 @@ When a new DNS request is received and processed, we store information about thi
 		"Reason":3,
 		"Rule":"...",
 		"FilterID":1,
+		"ServiceName":"..."
 		},
 	"Elapsed":12345,
 	"Upstream":"...",

querylog/decode.go

@@ -56,6 +56,8 @@ func decodeLogEntry(ent *logEntry, str string) {
 		case "Reason":
 			i, err = strconv.Atoi(v)
 			ent.Result.Reason = dnsfilter.Reason(i)
+		case "ServiceName":
+			ent.Result.ServiceName = v
 
 		case "Upstream":
 			ent.Upstream = v