fix more than 1 IP are added in device.
fix more than 1 IP are added in device.

zstackio/zstack-utility,zstackio/zstack-utility,live4thee/zstack-utility,zstackorg/zstack-utility,mingjian2049/zstack-utility,mrwangxc/zstack-utility,zstackorg/zstack-utility,zstackorg/zstack-utility,live4thee/zstack-utility,mingjian2049/zstack-utility,live4thee/zstack-utility,zstackio/zstack-utility,mingjian2049/zstack-utility,mrwangxc/zstack-utility,mrwangxc/zstack-utility