Update help text for netapp_server_port option

https://review.openstack.org/#/c/128700/ merged upstream in Kilo last
night; this change is a result of running the autohelp-wrapper from
openstack-doc-tools on the master branch of cinder.

Change-Id: I1eb4ebb7e819e62d0d956f853f0f77265d07016e
Merge "Update help text for netapp_server_port option"