GitLab

* [Feature] Add dgl.reorder() to re-order graph according to specified strategy

* fix unit test failure for metis reorder

* fix unit test failure on mxnet_cpu

* refine unit test for dgl.reorder

* fix unit test failure on mxnet

* fix array_equal error for mxnet unit test

* fix unit test failure for mxnet

* convert metis output to numpy array explicitly
Co-authored-by: Tong He <hetong007@gmail.com>