Bump minor version to 2.2.1
Bump minor version to 2.2.1

Signed-off-by: Qun Li <1ea81f54854048d0a4d4fd61caceabb2a843281c@zstack.io>

zstackio/zstack,zstackorg/zstack,zstackio/zstack,MatheMatrix/zstack,zstackorg/zstack,camilesing/zstack,MatheMatrix/zstack,AlanJager/zstack,MatheMatrix/zstack,AlanJager/zstack,AlanJager/zstack,camilesing/zstack,zstackio/zstack,camilesing/zstack