Extract common code from get_fc_wwpns and get_fc_wwnns

[ling-yun]

Since get_fc_wwpns and get_fc_wwnns has almost the same code, so extract common code from these two function and add a flag to identify what info to collect.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/104557

[David McNally (dave-mcnally)]

I'm all for code reuse and clearing up redundancy but I don't think this really constitutes a bug.

[OpenStack Infra (hudson-openstack)]

Change abandoned by Sean Dague (<email address hidden>) on branch: master
Review: https://review.openstack.org/104557
Reason: This patch seems effectively abandoned. Please restore if you are still working on it.

[Davanum Srinivas (DIMS) (dims-v)]

Removing "In Progress" status and assignee as change is abandoned.

[Markus Zoeller (markus_z) (mzoeller)]

That's a refactoring task, neither a bug nor a feature requests, that's why I'm closing this report. If you want to work on that, just push a change for review. Be prepared that refactoring tasks don't get much attention due to the current huge review backlog.