Remove kv-namespace-worker

This commit removes the namespace kv worker and related code, now that
we talk over gRPC to the server, and not directly to the DB, we should
not need this anymore.

machine_test.go

@@ -1,7 +1,6 @@
 package headscale
 
 import (
-	"encoding/json"
 	"strconv"
 	"time"
 
@@ -88,18 +87,6 @@ func (s *Suite) TestDeleteMachine(c *check.C) {
 	err = app.DeleteMachine(&machine)
 	c.Assert(err, check.IsNil)
 
-	namespacesPendingUpdates, err := app.getValue("namespaces_pending_updates")
-	c.Assert(err, check.IsNil)
-
-	names := []string{}
-	err = json.Unmarshal([]byte(namespacesPendingUpdates), &names)
-	c.Assert(err, check.IsNil)
-	c.Assert(names, check.DeepEquals, []string{namespace.Name})
-
-	app.checkForNamespacesPendingUpdates()
-
-	namespacesPendingUpdates, _ = app.getValue("namespaces_pending_updates")
-	c.Assert(namespacesPendingUpdates, check.Equals, "")
 	_, err = app.GetMachine(namespace.Name, "testmachine")
 	c.Assert(err, check.NotNil)
 }