systemctl task updated

Author: zoroz

src/FlubuCore/Tasks/Linux/SystemCtlTask.cs

@@ -7,11 +7,19 @@ public class SystemCtlTask : TaskBase<int, SystemCtlTask>
     {
         private readonly string _command;
         private readonly string _service;
+        private readonly string _host;
 
-        public SystemCtlTask(string command, string service)
+        /// <summary>
+        /// Control systemd services.
+        /// </summary>
+        /// <param name="command">Command to execute (start, stop, status, ...)</param>
+        /// <param name="service">Execute command for service unit.</param>
+        /// <param name="host">Execute command on a remote host.</param>
+        public SystemCtlTask(string command, string service, string host)
         {
             _command = command;
             _service = service;
+            _host = host;
         }
 
         protected override string Description { get; set; }
@@ -25,6 +33,9 @@ protected override int DoExecute(ITaskContextInternal context)
 
             if (DoNotFail)
                 task.DoNotFailOnError();
+            
+            if (!string.IsNullOrEmpty(_host))
+                task.WithArguments("-H", _host);
 
             return task.Execute(context);
         }