Replace all "Filter" field with "Filters" for consistency

In file `api/types/client.go`, some of the "*Options{}" structs own a
`Filters` field while some else have the name of `Filter`, this commit
will rename all `Filter` to `Filters` for consistency. Also `Filters`
is consistent with API with format `/xxx?filters=xxx`, that's why
`Filters` is the right name.

Signed-off-by: Zhang Wei <zhangwei555@huawei.com>

command/service/list.go

@@ -51,7 +51,7 @@ func runList(dockerCli *command.DockerCli, opts listOptions) error {
 	client := dockerCli.Client()
 	out := dockerCli.Out()
 
-	services, err := client.ServiceList(ctx, types.ServiceListOptions{Filter: opts.filter.Value()})
+	services, err := client.ServiceList(ctx, types.ServiceListOptions{Filters: opts.filter.Value()})
 	if err != nil {
 		return err
 	}
@@ -63,7 +63,7 @@ func runList(dockerCli *command.DockerCli, opts listOptions) error {
 			taskFilter.Add("service", service.ID)
 		}
 
-		tasks, err := client.TaskList(ctx, types.TaskListOptions{Filter: taskFilter})
+		tasks, err := client.TaskList(ctx, types.TaskListOptions{Filters: taskFilter})
 		if err != nil {
 			return err
 		}

command/service/ps.go

@@ -64,7 +64,7 @@ func runPS(dockerCli *command.DockerCli, opts psOptions) error {
 		}
 	}
 
-	tasks, err := client.TaskList(ctx, types.TaskListOptions{Filter: filter})
+	tasks, err := client.TaskList(ctx, types.TaskListOptions{Filters: filter})
 	if err != nil {
 		return err
 	}