In https://review.openstack.org/#/c/286876 the use_forwarded_for
option was removed from the Manila configuration. Manila does support
that option so it should be kept for logs to include the appropriate
clien IP address.
TrivialFix
Change-Id: I0279ad24a2331ce7e6e292549013b9553fe1a6f3
Related-Bug: #1548935