Comment 6 for bug 1661609

Reviewed: https://review.openstack.org/435108
Committed: https://git.openstack.org/cgit/openstack/nova-powervm/commit/?id=f492aebc1a0fcc3a1f3938d6798746b71f5453ac
Submitter: Jenkins
Branch: stable/newton

commit f492aebc1a0fcc3a1f3938d6798746b71f5453ac
Author: Esha Seth <email address hidden>
Date: Fri Feb 3 09:26:47 2017 -0500

    Fix VirtualInterfacePlugException message info

    In vif.py plug method, the HttpError exception reason
    will be specified to make VirtualInterfacePlugException
    raised more meaningful.

    In SRIOV vif driver plug code, if no ethernet ports are
    found on a physical network for an instance then instead
    of vif details this change will furnish instance mac
    address as more meaningful data to user.

    Closes-bug: #1661609
    (cherry picked from commit 2fcd97e1b38452dbf6492639b923417d4d7e93e4)
    Change-Id: Ia9072f45829018c51ba42e5cb032bff7d7eadd23
    Conflicts:
     nova_powervm/virt/powervm/vif.py