svn commit: r29457 - /release/incubator/mxnet/1.2.1/

[zhasheng]

Author: zhasheng
Date: Tue Sep 18 00:13:15 2018
New Revision: 29457

Log:
remove old 1.2.1 release

Removed:
    release/incubator/mxnet/1.2.1/