In do_image_import, gc.images.image_import may be called from two
different places, depending on the command used ("glance image-import"
or "glance image-create-via-import"). Make sure we always pass the
remote_* arguments to gc.images.import.
Change-Id: I76c6ea00523d93bad900776866de6ba22bc516b4
Partial-Bug: #2012442