Virtual port is not supported in VNX driver

[Tina Tang]

VNX support virtual ports on its iSCSI port, but the VNX driver doesn't support it. When the virtual port is used, the volume attach may failed.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/214044

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/214044
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=65fb5f817eca2049c6872d63c1332c7c337ff9e2
Submitter: Jenkins
Branch: master

commit 65fb5f817eca2049c6872d63c1332c7c337ff9e2
Author: Tina <email address hidden>
Date: Wed Aug 5 23:11:13 2015 -0400

    Fix the virtual port support in VNX driver

    VNX support virtual port on each physical iSCSI port. The
    driver used some incorrect command which cannot get the virtual
    port id information. This causes the driver to not be able to
    tell whether the registered port is a virtaul port or not.
    This change fixes the driver to use correct command and handle
    the virtual port id correctly.

    Change-Id: I11994dd5a0c8da74fcf15668f49796a45719b5e4
    Closes-Bug: #1485484