Fix README Build Status (#16183)

* Fix README Build Status

* Add labels to Jenkins Badges

* Add more line breaks

README.md

@@ -23,7 +23,7 @@ Apache MXNet (incubating) for Deep Learning
 =====
 | Master         | Docs          | License  |
 | :-------------:|:-------------:|:--------:|
-| [![Build Status](http://jenkins.mxnet-ci.amazon-ml.com/job/incubator-mxnet/job/master/badge/icon)](http://jenkins.mxnet-ci.amazon-ml.com/job/incubator-mxnet/job/master/)  | [![Documentation Status](http://jenkins.mxnet-ci.amazon-ml.com/job/restricted-website-build/badge/icon)](https://mxnet.incubator.apache.org/) | [![GitHub license](http://dmlc.github.io/img/apache2.svg)](./LICENSE) |
+[![CentOS CPU Build Status](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/centos-cpu/job/master/badge/icon?subject=build%20centos%20cpu)](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/centos-cpu/job/master/) [![CentOS GPU Build Status](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/centos-gpu/job/master/badge/icon?subject=build%20centos%20gpu)](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/centos-gpu/job/master/) [![Clang Build Status](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/clang/job/master/badge/icon?subject=build%20clang)](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/clang/job/master/) <br> [![Edge Build Status](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/edge/job/master/badge/icon?subject=build%20edge)](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/edge/job/master/) [![Miscellaneous Build Status](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/miscellaneous/job/master/badge/icon?subject=build%20miscellaneous)](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/miscellaneous/job/master/) [![Sanity Build Status](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/sanity/job/master/badge/icon?subject=build%20sanity)](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/sanity/job/master/) <br> [![Unix CPU Build Status](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/unix-cpu/job/master/badge/icon?subject=build%20unix%20cpu)](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/unix-cpu/job/master/) [![Unix GPU Build Status](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/unix-gpu/job/master/badge/icon?subject=build%20unix%20gpu)](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/unix-gpu/job/master/) [![Website Build Status](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/website/job/master/badge/icon?subject=build%20website)](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/website/job/master/) <br> [![Windows CPU Build Status](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/windows-cpu/job/master/badge/icon?subject=build%20windows%20cpu)](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/windows-cpu/job/master/) [![Windows GPU Build Status](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/windows-gpu/job/master/badge/icon?subject=build%20windows%20gpu)](http://jenkins.mxnet-ci.amazon-ml.com/job/mxnet-validation/job/windows-gpu/job/master/) | [![Documentation Status](http://jenkins.mxnet-ci.amazon-ml.com/job/restricted-website-build/badge/icon)](https://mxnet.incubator.apache.org/) | [![GitHub license](http://dmlc.github.io/img/apache2.svg)](./LICENSE) |
 
 ![banner](https://raw.githubusercontent.com/dmlc/web-data/master/mxnet/image/banner.png)