[RFE] Allow creating a port providing node name instead of UUID

Though the ironic node names are unique, there is no option to create a port using the node name. The Cli accepts only node uuid to create port.

Steps to reproduce:
1. Try creating two nodes with same name

[root@Mitaka4 ~(keystone_admin)]# ironic node-create -d pxe_ipmitool --name node1
+--------------+--------------------------------------+
| Property | Value |
+--------------+--------------------------------------+
| chassis_uuid | |
| driver | pxe_ipmitool |
| driver_info | {} |
| extra | {} |
| name | node1 |
| properties | {} |
| uuid | dc0b8f90-e20c-443d-be95-4045a82ce10e |
+--------------+--------------------------------------+
[root@Mitaka4 ~(keystone_admin)]# ironic node-create -d pxe_ipmitool --name node1
A node with name node1 already exists. (HTTP 409)

2. Try creating a port using the unique node name

[root@Mitaka4 ~(keystone_admin)]# ironic port-create -n node1 -a 36:56:90:AB:67:90
Expected a uuid but received node1. (HTTP 400)

User must be able to create port using node names.