Comment 3 for bug 1774293

Reviewed: https://review.openstack.org/571332
Committed: https://git.openstack.org/cgit/openstack/os-brick/commit/?id=ba2569855d2f4a2a639205ed73cf20cdd3abda10
Submitter: Zuul
Branch: master

commit ba2569855d2f4a2a639205ed73cf20cdd3abda10
Author: Patrick East <email address hidden>
Date: Mon Jul 16 10:31:52 2018 -0700

    FC Allow for multipath volumes with different LUNs

    We made assumptions in the fibre channel connector code that
    there was only ever a single lun per volume, even with many
    wwns per connections. There is need to support multiple luns
    per multipath device, similar to how the iSCSI volumes work.

    What we do is allow a list for 'target_luns' and 'target_wwns'
    in the connection properties, similar to how the iSCSI connector
    treats things like 'target_portals', 'target_luns', etc. we
    then group together 'targets' as combination of wwpns and the
    lun associated with them. This grouping is used to through
    the attach and detach workflow now to determine dev paths and
    scsi target information for rescans.

    All existing calls with 'target_lun' and 'target_wwn' will
    continue working as before, the new plural keys are optional.

    Change-Id: I393a028457a162228666d8497b695984fefdfab4
    Closes-Bug: #1774293