docs(be): add comment

Author: fiftin

db_lib/AnsiblePlaybook.go

@@ -27,6 +27,10 @@ func (p AnsiblePlaybook) makeCmd(command string, args []string, environmentVars
 	cmd.Env = append(cmd.Env, fmt.Sprintf("PWD=%s", cmd.Dir))
 	cmd.Env = append(cmd.Env, "PYTHONUNBUFFERED=1")
 	cmd.Env = append(cmd.Env, "ANSIBLE_FORCE_COLOR=True")
+
+	// TODO: Following option doesn't work when password authentication used.
+	// 		 So, we need to check args for --ask-pass, --ask-become-pass or remove this code completely.
+	//       What reason to use this code: prevent hanging of semaphore when host key confirmation required.
 	//cmd.Env = append(cmd.Env, "ANSIBLE_SSH_ARGS=\"-o BatchMode=yes\"")
 
 	if environmentVars != nil {