Pass argument as params in test_port_update
Pass argument as params in test_port_update

This helps to avoid test failure when command
is used with flags alongside with params.

Change-Id: Idfd365304a8331bd57e6d4f1f8752db3f397bd57

openstack/python-ironicclient,NaohiroTamura/python-ironicclient,openstack/python-ironicclient,NaohiroTamura/python-ironicclient