core,webadmin: Openstack Image -> OpenStack Image

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=987945
Change-Id: I0a8c92e7e2d5b78e64ba55bb9636e97d86c3a8f9
Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>
frontend: display import button only for glance

Change-Id: Ie370a81f82ef4130e5afc06f234b9284d4e02462
Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>