Re-enabling test_operator.test_binary_math_operators (#11712) (#12053)
Re-enabling test_operator.test_binary_math_operators (#11712) (#12053)

Test passes on CPU and GPU (10000 runs)
szha/mxnet,DickJC123/mxnet,larroy/mxnet,szha/mxnet,eric-haibin-lin/mxnet,leezu/mxnet,sxjscience/mxnet,mbaijal/incubator-mxnet,apache/incubator-mxnet,mbaijal/incubator-mxnet,mbaijal/incubator-mxnet,reminisce/mxnet,larroy/mxnet,yajiedesign/mxnet,ForkedReposBak/mxnet,leezu/mxnet,eric-haibin-lin/mxnet,dmlc/mxnet,leezu/mxnet,reminisce/mxnet,yajiedesign/mxnet,zhreshold/mxnet,yajiedesign/mxnet,yajiedesign/mxnet,eric-haibin-lin/mxnet,dmlc/mxnet,szha/mxnet,leezu/mxnet,ptrendx/mxnet,larroy/mxnet,reminisce/mxnet,ForkedReposBak/mxnet,reminisce/mxnet,yajiedesign/mxnet,zhreshold/mxnet,eric-haibin-lin/mxnet,reminisce/mxnet,larroy/mxnet,sxjscience/mxnet,DickJC123/mxnet,tlby/mxnet,szha/mxnet,leezu/mxnet,szha/mxnet,zhreshold/mxnet,reminisce/mxnet,szha/mxnet,eric-haibin-lin/mxnet,ForkedReposBak/mxnet,eric-haibin-lin/mxnet,tlby/mxnet,apache/incubator-mxnet,ptrendx/mxnet,larroy/mxnet,tlby/mxnet,eric-haibin-lin/mxnet,ForkedReposBak/mxnet,szha/mxnet,ForkedReposBak/mxnet,ptrendx/mxnet,mbaijal/incubator-mxnet,leezu/mxnet,larroy/mxnet,mbaijal/incubator-mxnet,larroy/mxnet,tlby/mxnet,zhreshold/mxnet,ForkedReposBak/mxnet,leezu/mxnet,eric-haibin-lin/mxnet,DickJC123/mxnet,szha/mxnet,yajiedesign/mxnet,sxjscience/mxnet,yajiedesign/mxnet,larroy/mxnet,tlby/mxnet,reminisce/mxnet,eric-haibin-lin/mxnet,larroy/mxnet,sxjscience/mxnet,szha/mxnet,ForkedReposBak/mxnet,sxjscience/mxnet,ptrendx/mxnet,dmlc/mxnet,ptrendx/mxnet,sxjscience/mxnet,zhreshold/mxnet,tlby/mxnet,reminisce/mxnet,ptrendx/mxnet,mbaijal/incubator-mxnet,reminisce/mxnet,dmlc/mxnet,ForkedReposBak/mxnet,sxjscience/mxnet,ForkedReposBak/mxnet,sxjscience/mxnet,sxjscience/mxnet,zhreshold/mxnet,dmlc/mxnet,dmlc/mxnet,apache/incubator-mxnet,yajiedesign/mxnet,dmlc/mxnet,dmlc/mxnet,leezu/mxnet,dmlc/mxnet,yajiedesign/mxnet,ptrendx/mxnet,reminisce/mxnet,tlby/mxnet,tlby/mxnet,apache/incubator-mxnet,ptrendx/mxnet,mbaijal/incubator-mxnet,zhreshold/mxnet,DickJC123/mxnet,zhreshold/mxnet,leezu/mxnet,mbaijal/incubator-mxnet,tlby/mxnet,ptrendx/mxnet,mbaijal/incubator-mxnet,zhreshold/mxnet,ptrendx/mxnet,tlby/mxnet