[maven-release-plugin] rollback the release of disconf-core-2.1-0
[maven-release-plugin] rollback the release of disconf-core-2.1-0

nabilzhang/disconf,markyao/disconf,knightliao/disconf,knightliao/disconf,nabilzhang/disconf,markyao/disconf,nabilzhang/disconf,knightliao/disconf,knightliao/disconf,nabilzhang/disconf,nabilzhang/disconf,markyao/disconf,markyao/disconf,markyao/disconf,knightliao/disconf