Remove unnecessary imageRef setting from tests

In setUp(), a default imageRef is set already and it is not necessary
to set it in each test if that is not the purpose of the tests.
This patch removes such unnecessary imageRef setting for cleanup.

Change-Id: I2dcf79112d1e6adfbb634bf4c957bbb1238232d8
Refactor test_get_port_vnic_info 2 and 3

This patch addresses the comments left on review 121939 for
nova/tests/network/test_neutronv2.py, it removes duplicated code from
the added unit tests and corrects an identation issue.

Change-Id: I02c004297d4ee78e5695c3ca265052020f2fcfa3
Related-Bug: 1370077
Fix start/stop return active/stopped immediately in EC2 API

start/stop action is async. But the EC2 API is hard code the status
as start/stop finished immediately.

This patch fix start action return pending status, and stop action
return stopping status.

Change-Id: I0cf6db1dcb17c48a12fd62b0d707afd124b96b26
Closes-Bug: #1373230
Updated from global requirements

Change-Id: I51c791c1fb84451b2cefa264873e3b9f7bc78059
Merge "Updated from global requirements"
Merge "Remove unnecessary imageRef setting from tests"
Merge "Fix start/stop return active/stopped immediately in EC2 API"
Merge "Refactor test_get_port_vnic_info 2 and 3"