raw/ioat: fix device state after test

raw/ioat: fix device state after test

The ioat rawdev was initially started during the test, however was never
stopped. This would cause issues when running the test again, as the device
cannot be configured when in a running state.

The device is now stopped after the test has completed, or if the test is
terminated due to error.

Fixes: 849470d522ed ("raw/ioat: add configure, start and stop functions")
Cc: stable@dpdk.org
Signed-off-by: Ciara Power <ciara.power@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>