Pull request: dnsforward: upd svcp param ech name

Merge in DNS/adguard-home from upd-ech-dnsrewrite to master

Squashed commit of the following:

commit b5d9e8643fcb0d7fe7bc44c6d8fc8a9d3f2c9595
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Thu Apr 7 18:01:18 2022 +0300

    all: imp chlog

commit 447c5ea6bc2031d4af46578bdb8d724bff001ca0
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Thu Apr 7 15:40:18 2022 +0300

    dnsforward: upd svcp param ech name

internal/dnsforward/svcbmsg_test.go

@@ -87,14 +87,18 @@ func TestGenAnswerHTTPS_andSVCB(t *testing.T) {
 		svcb: dnssvcb("alpn", "h3"),
 		want: wantsvcb(&dns.SVCBAlpn{Alpn: []string{"h3"}}),
 		name: "alpn",
+	}, {
+		svcb: dnssvcb("ech", "AAAA"),
+		want: wantsvcb(&dns.SVCBECHConfig{ECH: []byte{0, 0, 0}}),
+		name: "ech",
 	}, {
 		svcb: dnssvcb("echconfig", "AAAA"),
 		want: wantsvcb(&dns.SVCBECHConfig{ECH: []byte{0, 0, 0}}),
-		name: "echconfig",
+		name: "ech_deprecated",
 	}, {
 		svcb: dnssvcb("echconfig", "%BAD%"),
 		want: wantsvcb(nil),
-		name: "echconfig_invalid",
+		name: "ech_invalid",
 	}, {
 		svcb: dnssvcb("ipv4hint", "127.0.0.1"),
 		want: wantsvcb(&dns.SVCBIPv4Hint{Hint: []net.IP{ip4}}),