ctr: update task kill to take exec-id

Signed-off-by: Jess Valarezo <valarezo.jessica@gmail.com>

task_opts.go

@@ -65,13 +65,23 @@ type KillInfo struct {
 	// All kills all processes inside the task
 	// only valid on tasks, ignored on processes
 	All bool
+	// ExecID is the ID of a process to kill
+	ExecID string
 }
 
 // KillOpts allows options to be set for the killing of a process
-type KillOpts func(context.Context, Process, *KillInfo) error
+type KillOpts func(context.Context, *KillInfo) error
 
 // WithKillAll kills all processes for a task
-func WithKillAll(ctx context.Context, p Process, i *KillInfo) error {
+func WithKillAll(ctx context.Context, i *KillInfo) error {
 	i.All = true
 	return nil
 }
+
+// WithKillExecID specifies the process ID
+func WithKillExecID(execID string) KillOpts {
+	return func(ctx context.Context, i *KillInfo) error {
+		i.ExecID = execID
+		return nil
+	}
+}