modify port test cases

[carmark]

Test Result

# go test -v -timeout 60m
finish init
=== RUN   Test
INFO: Testing against a remote daemon(tcp://us-west-1.hyper.sh:443)
[2016-08-13 02:17:56] github.com/hyperhq/hypercli/integration-cli.(*DockerSuite).TestPortHostBinding - 5.238844 sec
[2016-08-13 02:18:06] github.com/hyperhq/hypercli/integration-cli.(*DockerSuite).TestPortList - 57.458524 sec
[2016-08-13 02:19:05] github.com/hyperhq/hypercli/integration-cli.(*DockerSuite).TestUnpublishedPortsInPsOutput - 18.594692 sec
OK: 3 passed
--- PASS: Test (92.31s)
PASS
ok      github.com/hyperhq/hypercli/integration-cli 93.208s