Enable three retries for Docker build commands (#11877)
Enable three retries for Docker build commands (#11877)

This enabled retries for Docker build commands executed by our master and PR builds.
rahul003/mxnet,yajiedesign/mxnet,DickJC123/mxnet,ptrendx/mxnet,tlby/mxnet,apache/incubator-mxnet,rahul003/mxnet,zhreshold/mxnet,DickJC123/mxnet,ForkedReposBak/mxnet,sxjscience/mxnet,reminisce/mxnet,DickJC123/mxnet,sxjscience/mxnet,dmlc/mxnet,larroy/mxnet,ForkedReposBak/mxnet,yajiedesign/mxnet,tlby/mxnet,sxjscience/mxnet,DickJC123/mxnet,yajiedesign/mxnet,apache/incubator-mxnet,dmlc/mxnet,larroy/mxnet,leezu/mxnet,larroy/mxnet,eric-haibin-lin/mxnet,tlby/mxnet,rahul003/mxnet,leezu/mxnet,larroy/mxnet,szha/mxnet,sxjscience/mxnet,mbaijal/incubator-mxnet,leezu/mxnet,dmlc/mxnet,ptrendx/mxnet,ptrendx/mxnet,ptrendx/mxnet,eric-haibin-lin/mxnet,szha/mxnet,apache/incubator-mxnet,yajiedesign/mxnet,rahul003/mxnet,tlby/mxnet,ptrendx/mxnet,ForkedReposBak/mxnet,rahul003/mxnet,eric-haibin-lin/mxnet,larroy/mxnet,ptrendx/mxnet,dmlc/mxnet,mbaijal/incubator-mxnet,rahul003/mxnet,ptrendx/mxnet,szha/mxnet,eric-haibin-lin/mxnet,mbaijal/incubator-mxnet,tlby/mxnet,mbaijal/incubator-mxnet,sxjscience/mxnet,larroy/mxnet,szha/mxnet,leezu/mxnet,dmlc/mxnet,tlby/mxnet,mbaijal/incubator-mxnet,tlby/mxnet,leezu/mxnet,tlby/mxnet,yajiedesign/mxnet,zhreshold/mxnet,eric-haibin-lin/mxnet,reminisce/mxnet,ptrendx/mxnet,eric-haibin-lin/mxnet,szha/mxnet,zhreshold/mxnet,larroy/mxnet,mbaijal/incubator-mxnet,reminisce/mxnet,reminisce/mxnet,eric-haibin-lin/mxnet,leezu/mxnet,reminisce/mxnet,zhreshold/mxnet,ForkedReposBak/mxnet,szha/mxnet,reminisce/mxnet,ForkedReposBak/mxnet,yajiedesign/mxnet,zhreshold/mxnet,dmlc/mxnet,leezu/mxnet,sxjscience/mxnet,reminisce/mxnet,reminisce/mxnet,szha/mxnet,zhreshold/mxnet,yajiedesign/mxnet,tlby/mxnet,sxjscience/mxnet,eric-haibin-lin/mxnet,yajiedesign/mxnet,zhreshold/mxnet,larroy/mxnet,reminisce/mxnet,ForkedReposBak/mxnet,leezu/mxnet,dmlc/mxnet,ForkedReposBak/mxnet,rahul003/mxnet,eric-haibin-lin/mxnet,mbaijal/incubator-mxnet,leezu/mxnet,sxjscience/mxnet,mbaijal/incubator-mxnet,dmlc/mxnet,sxjscience/mxnet,dmlc/mxnet,ForkedReposBak/mxnet,reminisce/mxnet,zhreshold/mxnet,ForkedReposBak/mxnet,szha/mxnet,ptrendx/mxnet,szha/mxnet,yajiedesign/mxnet,rahul003/mxnet,apache/incubator-mxnet,rahul003/mxnet,larroy/mxnet,tlby/mxnet,ptrendx/mxnet,zhreshold/mxnet,mbaijal/incubator-mxnet