message: Disable some tests of F64 and U8
diff: @@ -5,6 +5,8 @@ ScalarComputationsTest.TanhDoubleScalar POPLAR // F64
  ScalarComputationsTest.AddTwoScalarsF64 POPLAR // F64
  DotOperationTest.OneElementVectorDotF64 POPLAR // F64
  DotOperationTest.VectorDotF64 POPLAR // F64
  +ConvertTest.ConvertR1F32ToR1F64 POPLAR // F64
  +ConvertTest.ConvertR1F64ToR1F32 POPLAR // F64
  UnaryOpTest.UnsignedAbsTestR1 POPLAR // U32
  UnaryOpTest.UnsignedSignTestR1 POPLAR // U32
  @@ -67,6 +69,9 @@ ParamsTest.ConstantR1U8Param POPLAR // U8
  ScalarComputationsTest.AddTwoScalarsU8 POPLAR // U8
  ReverseTest.Reverse4DU8ArrayOnDim23 POPLAR // U8
  PadTest.Pad4DU8Array POPLAR // U8
  +ConvertTest.ConvertR1U8ToR1F32 POPLAR // U8
  +ConvertTest.ConvertR1U8ToR1S32 POPLAR // U8
  +ConvertTest.ConvertR1U8ToR1U32 POPLAR // U8
  ConvolutionTest.Convolve3D_1x4x2x3x3_2x2x2x3x3_Valid POPLAR // 3d conv
  