Pull request: home: add bootstrap to mobileconfig, imp code

Updates #3568.

Squashed commit of the following:

commit ec342e6223e2b2efe9a8bf833d5406a44c6417e4
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon Sep 13 15:16:07 2021 +0300

    home: imp tests

commit 67cd771e631938d3e8a5340315314210de796174
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon Sep 13 14:34:03 2021 +0300

    home: add bootstrap to mobileconfig, imp code

internal/dnsforward/dns.go

@@ -340,7 +340,7 @@ func (s *Server) processRestrictLocal(ctx *dnsContext) (rc resultCode) {
 
 	// Restrict an access to local addresses for external clients.  We also
 	// assume that all the DHCP leases we give are locally-served or at
-	// least don't need to be unaccessable externally.
+	// least don't need to be inaccessible externally.
 	if s.subnetDetector.IsLocallyServedNetwork(ip) {
 		if !ctx.isLocalClient {
 			log.Debug("dns: %q requests for internal ip", d.Addr)

internal/dnsforward/dnsforward.go

@@ -364,7 +364,7 @@ func (s *Server) startLocked() error {
 const defaultLocalTimeout = 1 * time.Second
 
 // collectDNSIPAddrs returns IP addresses the server is listening on without
-// port numbersю  For internal use only.
+// port numbers.  For internal use only.
 func (s *Server) collectDNSIPAddrs() (addrs []string, err error) {
 	addrs = make([]string, len(s.conf.TCPListenAddrs)+len(s.conf.UDPListenAddrs))
 	var i int

internal/dnsforward/dnsforward_test.go

@@ -275,7 +275,7 @@ func TestServer(t *testing.T) {
 			client := dns.Client{Net: tc.net}
 
 			reply, _, err := client.Exchange(createGoogleATestMessage(), addr.String())
-			require.NoErrorf(t, err, "сouldn't talk to server %s: %s", addr, err)
+			require.NoErrorf(t, err, "couldn't talk to server %s: %s", addr, err)
 
 			assertGoogleAResponse(t, reply)
 		})
@@ -330,7 +330,7 @@ func TestServerWithProtectionDisabled(t *testing.T) {
 	client := &dns.Client{}
 
 	reply, _, err := client.Exchange(req, addr.String())
-	require.NoErrorf(t, err, "сouldn't talk to server %s: %s", addr, err)
+	require.NoErrorf(t, err, "couldn't talk to server %s: %s", addr, err)
 	assertGoogleAResponse(t, reply)
 }