Add scalaclean to make clean (#14322)
Add scalaclean to make clean (#14322)


DickJC123/mxnet,zhreshold/mxnet,yajiedesign/mxnet,tlby/mxnet,dmlc/mxnet,szha/mxnet,szha/mxnet,sxjscience/mxnet,sxjscience/mxnet,szha/mxnet,yajiedesign/mxnet,reminisce/mxnet,tlby/mxnet,ForkedReposBak/mxnet,eric-haibin-lin/mxnet,sxjscience/mxnet,ForkedReposBak/mxnet,DickJC123/mxnet,leezu/mxnet,sxjscience/mxnet,zhreshold/mxnet,zhreshold/mxnet,yajiedesign/mxnet,leezu/mxnet,szha/mxnet,eric-haibin-lin/mxnet,tlby/mxnet,larroy/mxnet,eric-haibin-lin/mxnet,tlby/mxnet,eric-haibin-lin/mxnet,szha/mxnet,eric-haibin-lin/mxnet,apache/incubator-mxnet,tlby/mxnet,dmlc/mxnet,leezu/mxnet,ForkedReposBak/mxnet,yajiedesign/mxnet,szha/mxnet,ForkedReposBak/mxnet,sxjscience/mxnet,larroy/mxnet,reminisce/mxnet,ForkedReposBak/mxnet,zhreshold/mxnet,leezu/mxnet,szha/mxnet,larroy/mxnet,reminisce/mxnet,zhreshold/mxnet,apache/incubator-mxnet,tlby/mxnet,dmlc/mxnet,larroy/mxnet,larroy/mxnet,dmlc/mxnet,eric-haibin-lin/mxnet,apache/incubator-mxnet,yajiedesign/mxnet,dmlc/mxnet,reminisce/mxnet,yajiedesign/mxnet,leezu/mxnet,larroy/mxnet,reminisce/mxnet,leezu/mxnet,zhreshold/mxnet,yajiedesign/mxnet,larroy/mxnet,tlby/mxnet,eric-haibin-lin/mxnet,reminisce/mxnet,apache/incubator-mxnet,ForkedReposBak/mxnet,zhreshold/mxnet,zhreshold/mxnet,dmlc/mxnet,leezu/mxnet,tlby/mxnet,DickJC123/mxnet,dmlc/mxnet,yajiedesign/mxnet,DickJC123/mxnet,szha/mxnet,sxjscience/mxnet,leezu/mxnet,reminisce/mxnet,dmlc/mxnet,sxjscience/mxnet,leezu/mxnet,sxjscience/mxnet,reminisce/mxnet,ForkedReposBak/mxnet,dmlc/mxnet,eric-haibin-lin/mxnet,zhreshold/mxnet,tlby/mxnet,yajiedesign/mxnet,tlby/mxnet,reminisce/mxnet,reminisce/mxnet,sxjscience/mxnet,larroy/mxnet,ForkedReposBak/mxnet,ForkedReposBak/mxnet,eric-haibin-lin/mxnet,szha/mxnet,larroy/mxnet