message: Clear out old reports to ensure correct counting of reports
  Summary:
  depending on how far each test got, there could have been reports
  lying around unread
  Test Plan: run this test
  Reviewers: jakeh, georgep
diff: @@ -35,6 +35,8 @@ class IpuFuseOpsTest(test_util.TensorFlowTestCase):
  report = gen_ipu_ops.ipu_event_trace()
  with tu.ipu_session() as sess:
  + sess.run(report)
  +
  fd = {
  pa: [-6.0, 0.0, 6.0]
  }
  @@ -60,6 +62,8 @@ class IpuFuseOpsTest(test_util.TensorFlowTestCase):
  report = gen_ipu_ops.ipu_event_trace()
  with tu.ipu_session() as sess:
  + sess.run(report)
  +
  fd = {
  pa: [-6.0, 0.0, 6.0]
  }
  @@ -88,6 +92,8 @@ class IpuFuseOpsTest(test_util.TensorFlowTestCase):
  report = gen_ipu_ops.ipu_event_trace()
  with tu.ipu_session() as sess:
  + sess.run(report)
  +
  fd = {
  pa: [2.0, 0.5, 1.0],
  pb: [-1.0, 1.0, 6.0]
  @@ -167,6 +173,8 @@ class IpuFuseOpsTest(test_util.TensorFlowTestCase):
  report = gen_ipu_ops.ipu_event_trace()
  with tu.ipu_session() as sess:
  + sess.run(report)
  +
  fd = {
  pa: [2.0, 0.5, 1.0],
  pb: [-1.0, 1.0, 6.0]
  @@ -194,6 +202,8 @@ class IpuFuseOpsTest(test_util.TensorFlowTestCase):
  report = gen_ipu_ops.ipu_event_trace()
  with tu.ipu_session() as sess:
  + sess.run(report)
  +
  fd = {
  pa: np.ones([1,1,10,10]),
  }
  @@ -223,7 +233,6 @@ class IpuFuseOpsTest(test_util.TensorFlowTestCase):
  report = gen_ipu_ops.ipu_event_trace()
  with tu.ipu_session() as sess:
  - # Clear old reports
  sess.run(report)
  fe = {
  @@ -255,7 +264,6 @@ class IpuFuseOpsTest(test_util.TensorFlowTestCase):
  report = gen_ipu_ops.ipu_event_trace()
  with tu.ipu_session() as sess:
  - # Clear old reports
  sess.run(report)
  fd = {
  @@ -289,7 +297,6 @@ class IpuFuseOpsTest(test_util.TensorFlowTestCase):
  report = gen_ipu_ops.ipu_event_trace()
  with tu.ipu_session() as sess:
  - # Clear old reports
  sess.run(report)
  fd = {
  