Pull request: 2343 http server

Merge in DNS/adguard-home from 2343-http-server to master

Closes #2343.

Squashed commit of the following:

commit f4ebfc129484fc3489409069b3580eb70d71cc74
Merge: b13ec7002 36c7735b8
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Wed Nov 25 15:37:27 2020 +0300

    Merge branch 'master' into 2343-http-server

commit b13ec70024f24f6b68b13a1ec6f27c89535feaf8
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Wed Nov 25 15:31:36 2020 +0300

    all: record changes

commit ce44aac9d43e32db3f68746dec7a4f21b0a9dea4
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Wed Nov 25 14:00:45 2020 +0300

    home: set http servers timeouts

commit 7f3e7385d1df39b39713b8ec443da5d9374d0bc8
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Tue Nov 24 19:58:56 2020 +0300

    home: replace default ServeMux with custom one.

internal/home/home.go

@@ -67,6 +67,9 @@ type homeContext struct {
 
 	ipDetector *ipDetector
 
+	// mux is our custom http.ServeMux.
+	mux *http.ServeMux
+
 	// Runtime properties
 	// --
 
@@ -187,6 +190,8 @@ func setupContext(args options) {
 			os.Exit(0)
 		}
 	}
+
+	Context.mux = http.NewServeMux()
 }
 
 func setupConfig(args options) {
@@ -306,6 +311,10 @@ func run(args options) {
 		firstRun: Context.firstRun,
 		BindHost: config.BindHost,
 		BindPort: config.BindPort,
+
+		ReadTimeout:       ReadTimeout,
+		ReadHeaderTimeout: ReadHeaderTimeout,
+		WriteTimeout:      WriteTimeout,
 	}
 	Context.web = CreateWeb(&webConf)
 	if Context.web == nil {