Pull request: * all: move internal Go packages to internal/

Merge in DNS/adguard-home from 2234-move-to-internal to master

Squashed commit of the following:

commit d26a288cabeac86f9483fab307677b1027c78524
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Fri Oct 30 12:44:18 2020 +0300

    * all: move internal Go packages to internal/

    Closes #2234.

internal/dnsforward/ipset_test.go

@@ -0,0 +1,41 @@
+package dnsforward
+
+import (
+	"testing"
+
+	"github.com/AdguardTeam/dnsproxy/proxy"
+	"github.com/miekg/dns"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIPSET(t *testing.T) {
+	s := Server{}
+	s.conf.IPSETList = append(s.conf.IPSETList, "HOST.com/name")
+	s.conf.IPSETList = append(s.conf.IPSETList, "host2.com,host3.com/name23")
+	s.conf.IPSETList = append(s.conf.IPSETList, "host4.com/name4,name41")
+	c := ipsetCtx{}
+	c.init(s.conf.IPSETList)
+
+	assert.Equal(t, "name", c.ipsetList["host.com"][0])
+	assert.Equal(t, "name23", c.ipsetList["host2.com"][0])
+	assert.Equal(t, "name23", c.ipsetList["host3.com"][0])
+	assert.Equal(t, "name4", c.ipsetList["host4.com"][0])
+	assert.Equal(t, "name41", c.ipsetList["host4.com"][1])
+
+	_, ok := c.ipsetList["host0.com"]
+	assert.False(t, ok)
+
+	ctx := &dnsContext{
+		srv: &s,
+	}
+	ctx.proxyCtx = &proxy.DNSContext{}
+	ctx.proxyCtx.Req = &dns.Msg{
+		Question: []dns.Question{
+			{
+				Name:  "host.com.",
+				Qtype: dns.TypeA,
+			},
+		},
+	}
+	assert.Equal(t, resultDone, c.process(ctx))
+}