initialize_connection dothill_fc driver

[Walt Boring]

Nova's live migration calls cinder initialize_connection multiple times for the purposes of collecting the connection_info for a volume. Driver's need to be safe in initialize_connection and not assume that it's being called to create a new export on the array to the initiator.

drivers/dothill/dothill_fc.py
https://github.com/openstack/cinder/blob/master/cinder/volume/drivers/dothill/dothill_fc.py#L85-L87

[zhongyaniu (skyox)]

https://review.openstack.org/#/c/439426/

[Sean McGinnis (sean-mcginnis)]

Unassigning due to no activity for > 6 months.