fix flat DHCP IP not configured if there is already an IP on the interface
fix flat DHCP IP not configured if there is already an IP on the interface

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