Fix volume transfer href issue

The volume transfer collection in url defined as "os-volume-tranfer",
but I got another define "tranfers" in href url. They are different.
So it should be modify.

closes-bug: #1242980
Change-Id: I69a43012f2bb70ce5fc7b0331d2759527a261170
(cherry picked from commit b104d1c0c70898b59b6668970e05cebadecd064a)
Merge "Fix volume transfer href issue" into stable/havana