Support white list in initialize_connection

[Peter Wang]

Currently, VNX cinder driver registers host initiator to all configured iSCSI/FC ports on array
and return port(s) of all available portin initialize_connection

by introducing a new driver option io_port_list:
1. driver will only register initiator to ports in io_port_list .
2. driver will only return ports in io_port_list when initialize_connection

Thanks
Peter

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/196979
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=ac2157ecebe2bc9b4014b1e592d728fed90e7eb2
Submitter: Jenkins
Branch: master

commit ac2157ecebe2bc9b4014b1e592d728fed90e7eb2
Author: peter_wang <email address hidden>
Date: Mon Jun 29 22:56:40 2015 -0400

    Add white list support for target ports in VNX driver

    Currently, VNX cinder driver registers host initiator to all
    configured iSCSI/FC ports on array and chooses ports from
    all available ports to return in initialize_connection.

    By introducing a new driver option io_port_list:
    1. driver will only register initiator to ports in io_port_list
    2. driver will only return ports in io_port_list from initialize_connection

    Change-Id: Ie64eceb73bc0d70076033a29295c3efc57f34db4
    Closes-Bug: 1470003