message: Fix conv tests with latests poplar
  Test Plan: All tests pass with latest poplar
  Reviewers: jakeh, davidn
diff: @@ -461,7 +461,7 @@ class IpuXlaConvTest(test_util.TensorFlowTestCase):
  ok = ['progIdCopy',
  'host-exchange-local-copy-',
  - 'Copy_partialReduceOut_to_partialReduceOut[[]cloned[]]/OnTileCopy',
  + 'Copy_',
  'DepthwiseConv2dNativeBackpropFilter/convolution.*.clone/Conv_6x6']
  self.assertTrue(tu.check_all_compute_sets_and_list(cs_list, ok))
  @@ -496,7 +496,7 @@ class IpuXlaConvTest(test_util.TensorFlowTestCase):
  ok = ['progIdCopy',
  'host-exchange-local-copy-',
  'DepthwiseConv2dNativeBackpropFilter/convolution.*.clone/Conv_6x6',
  - 'Copy_partialReduceOut_to_partialReduceOut[[]cloned[]]/OnTileCopy',
  + 'Copy_',
  'Relu/call.*/Nonlinearity']
  self.assertTrue(tu.check_all_compute_sets_and_list(cs_list, ok))
  