Unexpected behavior when "-d" is specified twice on ironic chassis-create

when the user enters a command "ironic chassis-create -d "test" -d "testing", it takes "testing" as a description and it avoids "test".So its avoiding the first argument and even it is not showing any erros messages.

# ironic chassis-create -d "test" -d "testing"
+-------------+--------------------------------------+
| Property | Value |
+-------------+--------------------------------------+
| description | testing |
| extra | {} |
| uuid | 306acc4b-e6b9-4cd6-b582-553c2d86e61f |
+-------------+--------------------------------------+

So we can do some changes in code so that when user enters this type of commands ,ironic client should give a error messages to restrict the usage of "-d" option twice in a command.

This problem is exist for ironic port-create too, for -n and -a options.