Retain the "mac" argument for backward compatibility

[vmud213]

Retain the "mac" argument for backward compatibility. As part of the changes made earlier to support setting/getting iSCSI information on iLO hardware, "mac" arguement is removed. This breaks backward compatibilty. Need changes in the library to retain the mac parameter.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/535764

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/535764
Committed: https://git.openstack.org/cgit/openstack/proliantutils/commit/?id=42f14bd6a797bc79b74a573fd434a94da025e6fc
Submitter: Zuul
Branch: master

commit 42f14bd6a797bc79b74a573fd434a94da025e6fc
Author: vmud213 <email address hidden>
Date: Fri Jan 19 17:43:54 2018 +0530

    Retain "mac" argument for backward compatibility

    Add methods to support backward compatibility by retaining the "mac" argument
    for the exisiting methods that support managing iSCSI information.

    Change-Id: I5e006556e5303fd8febc836b1bd355b87933f1eb
    Closes-Bug: #1744307