i40e: close client on remove and shutdown

i40e: close client on remove and shutdown

When the driver is removed or shut down, close any attached clients
(i.e. i40iw). This prevents a panic seen sometimes on forced driver
removal or system shutdown when iWarp is running.

Change-ID: I4f6161e5a73ffbb2fd5883567b007310302bfcb5
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Orabug: 26785018
(cherry picked from commit 921c467c6bf8f6fe5cd139b0535ad42b952330f0)
Signed-off-by: Jack Vogel <jack.vogel@oracle.com>
Reviewed-by: Kyle Fortin <kyle.fortin@oracle.com>