Merge: - clients: fix rename

Close #1340

Squashed commit of the following:

commit 95f0291c681f98c29f4014b651c159d387301af4
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Thu Jan 9 18:56:23 2020 +0300

    add test

commit 293be277e245ff2f430e8c1e9ee3e82dc7da0995
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Thu Jan 9 16:04:36 2020 +0300

    - clients: fix rename

home/clients_test.go

@@ -114,6 +114,7 @@ func TestClients(t *testing.T) {
 	c = Client{}
 	c, b = clients.Find("1.1.1.2")
 	assert.True(t, b && c.Name == "client1-renamed" && c.IDs[0] == "1.1.1.2" && c.UseOwnSettings)
+	assert.True(t, clients.list["client1"] == nil)
 
 	// failed remove - no such name
 	if clients.Del("client3") {